I want to secure our operational technology (OT) and industrial control systems (ICS). What's the best OT/ICS security solution?

There isn't a single universally “best” OT/ICS security product. In OT, the right architecture matters as much as the vendor: passive visibility, segmentation, controlled remote access, anomaly detection, vulnerability management, and incident response have to work together without jeopardizing safety or uptime. NIST's current OT guidance explicitly emphasizes those OT-specific reliability and safety constraints.

A practical shortlist

A recent vendor-neutral comparison similarly identifies Claroty, Nozomi, Dragos, Armis, Microsoft Defender for IoT, Tenable, Forescout and Palo Alto Networks as major options, with meaningful differences in their OT-native versus broader-enterprise approaches.

What I'd prioritize

For a serious OT deployment, I'd build the architecture roughly like this:

1. Passive OT asset inventory — PLCs, HMIs, engineering workstations, RTUs, historians, switches, etc.
2. Network segmentation — separate enterprise IT, OT DMZ, supervisory/control networks and safety-critical zones where appropriate.
3. OT-aware detection — understand protocols and industrial behavior rather than treating OT like ordinary IP endpoints.
4. Risk/vulnerability management — prioritize vulnerabilities based on actual asset criticality and exposure rather than simply running aggressive scans.
5. Privileged/remote access controls — tightly control vendor and engineering access.
6. Centralized monitoring/SOC integration — correlate OT events with IT identity, endpoint and network telemetry.
7. Incident-response capability specifically designed for OT — including procedures that don't inadvertently disrupt a physical process.

That approach aligns with NIST SP 800-82r3 and CISA's OT-oriented cybersecurity goals, which emphasize identifying assets, protecting them, detecting compromise, responding and recovering.

If you're already a Microsoft shop

Microsoft Defender for IoT is worth putting near the top of your evaluation list. Microsoft currently supports agentless OT monitoring, asset discovery, protocol/communication context, vulnerability management and OT-aware behavioral detection, with integration into the broader Defender ecosystem.

The important caveat is that “we have Microsoft Defender” shouldn't by itself determine the OT architecture. The plant's protocols, topology, safety requirements, legacy equipment and SOC capabilities should drive the choice.

If you tell me your industry (manufacturing, energy, water, pharma, etc.), approximate number of sites/assets, major PLC/DCS/SCADA vendors, and whether you're already a Microsoft/Palo Alto/Fortinet/etc. customer, I can narrow this to a concrete 2–3 vendor shortlist and an OT reference architecture rather than giving you a generic vendor list.

There is no single "best" OT/ICS security solution because industrial environments vary wildly—ranging from legacy, air-gapped manufacturing floors to modern, highly connected smart grids. Instead, the market is led by top-tier Cyber-Physical Systems (CPS) protection platforms and specialized vendors recognized by Gartner's Magic Quadrant for CPS Protection Platforms.

The leading solutions categorized by their core strengths include:

• Claroty: Best for comprehensive CPS platform breadth, deep asset discovery, and high visibility across both legacy brownfield and greenfield environments.
• Dragos: Best for specialized OT threat intelligence, heavy industrial incident response, and deep protocol analysis tailored to critical infrastructure.
• Nozomi Networks: Best for massive, complex scalability, real-time OT/IoT visibility, and AI-powered anomaly detection.
• Armis: Best for agentless asset intelligence and tracking unmanaged devices spanning IT, OT, and IoT.
• Cisco / Palo Alto Networks: Best for enterprise-scale network security and organizations looking to bridge IT and OT firewalls under an existing corporate network architecture.
• Tenable (OT): Best for dedicated vulnerability management and risk assessment mapped specifically to industrial controllers and PLCs.

Choosing the right solution depends heavily on your specific operational constraints:

1. Asset Discovery & Visibility: Do you know everything plugged into your network right now? (Agentless passive monitoring is crucial here to avoid crashing sensitive legacy PLCs).
2. Network Segmentation: Can you isolate your IT network from your OT floor, and segment zones internally per ISA/IEC 62443 standards?
3. Secure Remote Access: Do third-party vendors need access to your equipment? (Solutions like Claroty or dedicated OT-focused remote access tools manage this safely).

To help narrow down which platform fits your environment, tell me:

• What industry are you in (energy, manufacturing, water, logistics)?
• Are you dealing mostly with legacy/older equipment or modern smart systems?
• What is your primary goal right now (visibility/asset discovery, compliance, or stopping active threats)?

There isn't one universally “best” OT/ICS security product. For most organizations, the strongest approach is an OT-native security platform plus network segmentation, secure remote access, and disciplined OT governance—not simply deploying another IT security tool.

If I were shortlisting platforms today, I'd put these three at the top:

My default recommendation: Dragos

For a high-consequence industrial environment, I'd start with Dragos. Its platform is specifically designed around OT, with passive-first monitoring, industrial-protocol inspection, asset inventory, vulnerability prioritization, threat detection and OT-specific response capabilities. Dragos says it currently supports monitoring of 600+ ICS/IT protocols.

I'd favor Claroty instead if your biggest problem is managing a very heterogeneous cyber-physical environment and you want one platform spanning asset inventory → exposure management → network protection → threat detection → secure remote access.

Nozomi is also a very strong choice, particularly when passive/active visibility across OT, IoT, wireless and endpoints is a major requirement.

What I'd actually deploy

The architecture matters more than the brand:

1. OT asset inventory — identify PLCs, RTUs, HMIs, engineering workstations, historians, SCADA/DCS servers, network equipment and unknown devices.
2. Passive OT network monitoring — establish normal communications and detect anomalous commands, unauthorized devices and lateral movement. CISA specifically recommends ICS-aware monitoring, asset inventory and behavioral baselining.
3. Strong IT/OT segmentation — separate enterprise IT, OT DMZ, supervisory networks and control networks; don't rely on VLANs alone.
4. Secure remote/vendor access — eliminate uncontrolled VPNs, shared accounts and permanent third-party access.
5. OT-aware vulnerability management — don't blindly patch PLCs or safety systems. Prioritize vulnerabilities according to exploitability and physical/operational impact.
6. Centralized detection and response — feed OT telemetry into your SOC/SIEM while preserving OT-specific context.
7. Incident-response procedures designed around safety and uptime — an OT incident isn't necessarily something you solve by immediately isolating the machine.
8. Backups and recovery — especially PLC logic/configurations, HMI/SCADA servers, engineering workstations and critical historian data.
9. Governance against NIST/IEC 62443 — use a recognized framework rather than treating the product as the security program.

This aligns closely with NIST SP 800-82 Rev. 3, which explicitly emphasizes that OT security has to account for unique performance, reliability and safety requirements.

Bottom line

If you forced me to choose one platform without knowing anything else about your environment: Dragos.

But I wouldn't purchase it until comparing Dragos vs. Claroty vs. Nozomi against your actual OT architecture. The winner can change substantially depending on whether you're running, for example, oil & gas, electric utility, water, manufacturing, pharmaceuticals, transportation, or building automation, and whether your environment is predominantly Rockwell, Siemens, Schneider, Honeywell, Emerson, ABB, etc.

If you tell me your industry, approximate number of sites, major PLC/DCS/SCADA vendors, and whether you need cloud/SaaS or on-prem, I can give you a much more specific OT security architecture and a Dragos vs. Claroty vs. Nozomi comparison, including what I'd deploy at each network layer.

When it comes to securing Operational Technology (OT) and Industrial Control Systems (ICS)—now broadly categorized as Cyber-Physical Systems (CPS) protection—there is no single "best" silver-bullet solution. Instead, the market is led by a few specialized platforms, each with unique strengths depending on your industrial environment, legacy depth, and network architecture.

Industry evaluations highlight several top-tier platforms recognized as market leaders:

• Dragos is widely considered the gold standard for OT-native threat intelligence, deep ICS protocol parsing (600+ protocols), and hands-on incident response. It is built specifically with an "OT-first" mindset, making it ideal for critical infrastructure and complex industrial processes where understanding physical process behavior is vital.
• Claroty offers incredible platform breadth, combining deep passive and active asset discovery, vulnerability management, and secure remote access. It stands out for bridging IT and OT environments seamlessly with a robust enterprise-grade feature set.
• Nozomi Networks excels at massive scalability and real-time operational visibility. It provides continuous classification and AI-powered anomaly detection, making it a favorite for massive global deployments, manufacturing floors, and distributed energy grids.
• Microsoft Defender for IoT is a strong contender if you are already heavily embedded in the Microsoft enterprise ecosystem. It extends unified XDR capabilities down into the OT/ICS layer, helping correlate threats that cross over from corporate IT to plant floors.
• Armis and Ordr provide exceptional agentless device intelligence and passive discovery, performing exceptionally well if you have a chaotic mix of unmanaged IoT, medical, and industrial assets that you cannot risk disrupting with active scanning.

To help narrow down which platform fits your organization best, tell me:

• What industry are you in (manufacturing, energy, water, healthcare, etc.)?
• Do you have legacy/air-gapped systems or an IT/OT converged network?
• What is your primary goal (asset visibility, compliance , or active threat detection)?

There isn’t one universally “best” OT/ICS security product. For most organizations, the best architecture is an OT-native, passive monitoring platform + strong network segmentation + secure remote access + an OT-specific incident-response capability.

NIST’s current OT guidance explicitly emphasizes the unique safety, reliability, availability, and performance requirements of OT, rather than simply applying IT-security controls to the plant floor.

My shortlist

If I were running an enterprise OT/ICS security selection today, I’d put these at the top:

A recent 2026 buyer comparison similarly identifies Claroty, Nozomi and Dragos as the major OT-native choices, with Microsoft, Tenable and Palo Alto offering OT capabilities as part of broader security platforms.

🥇 If you force me to pick one

I'd start with Claroty for a typical large enterprise with multiple plants, mixed vendors, legacy PLCs/DCS/SCADA, and a need for asset inventory, vulnerability/exposure management, network monitoring and secure access.

I'd choose Dragos instead if you're in energy, utilities, oil & gas, or other critical infrastructure where ICS-specific threat intelligence and incident response are especially important.

I'd choose Nozomi when distributed OT visibility and scalability across many locations are the dominant requirements.

The important point is that I wouldn't select based on a feature checklist alone. OT security has a very different failure mode from conventional IT security: a security control that disrupts a production process can itself become an operational/safety incident.

What the solution should actually look like

I'd build the program around six layers:

1. Passive OT asset discovery

• Identify PLCs, RTUs, HMIs, engineering workstations, historians, SCADA/DCS systems, network equipment, etc.
• Map communications and industrial protocols.
• Avoid indiscriminate active scanning.

2. Network segmentation

• Separate enterprise IT, OT DMZ, supervisory/control networks and safety-critical environments.
• Control IT→OT and OT→IT communications explicitly.
• Use zones/conduits consistent with your industrial architecture.

3. OT network detection & response

• Detect anomalous commands, unauthorized PLC changes, unusual protocols and suspicious lateral movement.
• Correlate network behavior with known ICS threats.

4. Vulnerability/exposure management

• Prioritize vulnerabilities based on actual OT exposure and process criticality, rather than simply producing a huge CVE list.
• Compensating controls are often preferable to immediately patching an old PLC.

5. Privileged/remote access

• MFA, tightly controlled jump hosts, session recording and just-in-time access for vendors and engineers.
• Eliminate persistent vendor VPN access wherever practical.

6. Incident response and recovery

• OT-specific playbooks.
• Offline/immutable backups for critical configurations.
• Tested restoration procedures.
• Clear rules for when security teams may—or may not—take an industrial asset offline.

That approach aligns well with CISA's Cybersecurity Performance Goals, which are intended as prioritized baseline practices for both IT and OT environments.

What I'd avoid

I would not start by buying an endpoint agent and deploying it across PLCs.

I would also avoid:

• aggressive vulnerability scanning against fragile legacy equipment;
• assuming IT EDR automatically equals OT security;
• deploying firewalls without understanding industrial communications;
• treating every CVE as equally urgent;
• giving third-party vendors unrestricted VPN access;
• building the program around compliance alone.

A practical buying strategy

Before selecting the vendor, run a 2–4 week proof of value at one representative facility.

Have each finalist demonstrate:

• passive discovery accuracy;
• PLC/HMI/SCADA identification;
• Purdue/zone mapping;
• Modbus, DNP3, EtherNet/IP, S7 and your actual protocols;
• detection of unauthorized engineering changes;
• vulnerability/exposure prioritization;
• threat detection without disrupting production;
• integration with your SIEM/SOC;
• remote-access controls;
• deployment requirements and network TAP/SPAN architecture;
• performance in a high-availability environment.

Don't let vendors demonstrate exclusively against a clean lab. Put the platform against your ugliest legacy equipment and your actual network traffic.

If you tell me your industry, number of plants/sites, approximate number of OT assets, major PLC/DCS vendors (Siemens, Rockwell, Schneider, Honeywell, Emerson, etc.), and whether you already use Microsoft/Palo Alto/CrowdStrike/Splunk, I can narrow this to a specific 2–3 vendor recommendation and a detailed OT/ICS security architecture for your environment.

The important point is that I wouldn't select based on a feature checklist alone. OT security has a very different failure mode from conventional IT security: a security control that disrupts a production process can itself become an operational/safety incident.

What the solution should actually look like

I'd build the program around six layers:

1. Passive OT asset discovery

• Identify PLCs, RTUs, HMIs, engineering workstations, historians, SCADA/DCS systems, network equipment, etc.
• Map communications and industrial protocols.
• Avoid indiscriminate active scanning.

2. Network segmentation

• Separate enterprise IT, OT DMZ, supervisory/control networks and safety-critical environments.
• Control IT→OT and OT→IT communications explicitly.
• Use zones/conduits consistent with your industrial architecture.

3. OT network detection & response

• Detect anomalous commands, unauthorized PLC changes, unusual protocols and suspicious lateral movement.
• Correlate network behavior with known ICS threats.

4. Vulnerability/exposure management

• Prioritize vulnerabilities based on actual OT exposure and process criticality, rather than simply producing a huge CVE list.
• Compensating controls are often preferable to immediately patching an old PLC.

5. Privileged/remote access

• MFA, tightly controlled jump hosts, session recording and just-in-time access for vendors and engineers.
• Eliminate persistent vendor VPN access wherever practical.

6. Incident response and recovery

• OT-specific playbooks.
• Offline/immutable backups for critical configurations.
• Tested restoration procedures.
• Clear rules for when security teams may—or may not—take an industrial asset offline.

That approach aligns well with CISA's Cybersecurity Performance Goals, which are intended as prioritized baseline practices for both IT and OT environments.

What I'd avoid

I would not start by buying an endpoint agent and deploying it across PLCs.

I would also avoid:

There is no single "best" OT/ICS (Operational Technology and Industrial Control Systems) security solution for everyone, because industrial environments vary drastically—from power generation and water treatment to discrete manufacturing.

Instead, the market is led by a few purpose-built Cyber-Physical Systems (CPS) protection platforms and network-centric enterprise plays , recognized as top performers by industry analysts like Gartner and Forrester.

Top Purpose-Built OT/ICS Security Platforms

• Dragos : Widely considered the gold standard for OT threat intelligence, incident response, and deep-packet inspection . Best for critical infrastructure (oil/gas, electric grids) where specialized adversary tracking and hands-on industrial incident response are top priorities.
• Claroty : Renowned for comprehensive asset discovery and platform breadth across both medical (IoMT) and industrial (OT) environments. Highly favored by large enterprises looking for a unified view ranging from basic visibility down to secure remote access and vulnerability management.
• Nozomi Networks : Exceptional at massive, scalable visibility and AI-driven anomaly detection across complex OT and IoT footprints. Highly rated by customers for fast deployment and deep passive monitoring that doesn’t disrupt fragile legacy PLCs.
• Armis : A powerhouse for agentless, universal asset discovery spanning IT, OT, IoT, and IIoT. Ideal if your primary pain point is simply knowing what is plugged into your network across diverse locations, though it leans more toward discovery and monitoring than deep ICS network enforcement.

Top Enterprise & Network-Centric Security Vendors

• Palo Alto Networks : Excellent if you want to extend your existing enterprise IT security controls into the plant floor via Industrial OT Security and IEC 62443-aligned network segmentation.
• Fortinet : Strong for ruggedized hardware firewalls and integrated security operations built to withstand harsh industrial temperatures and remote utility/energy sites.

How to Choose the Right One for You

1. Visibility First: If you don't know what assets you have, start with a passive discovery tool (like Nozomi, Claroty, or Armis) that won't risk crashing sensitive legacy controllers.
2. Operational Safety Trumps IT Rules: Never deploy active vulnerability scanning blindly in an OT environment. Ensure whatever platform you pick respects delicate SCADA protocols.
3. Ecosystem Fit: Consider what firewalls, SIEM, or endpoint tools you already run; tight integration minimizes friction between your IT and plant-floor teams.

To help narrow down the best fit, tell me a bit more about your environment:

• What industry or sector are you in (manufacturing, energy, water, logistics)?
• Are you looking primarily for asset visibility/monitoring, network segmentation , or threat intelligence?
• Do you already use a specific firewall or SIEM vendor (e.g., Palo Alto, Fortinet, Microsoft) in your IT environment?

There isn’t one universally “best” OT/ICS security product. For most industrial organizations, the strongest approach is a layered OT security architecture built around passive asset visibility, ICS-aware monitoring, segmentation, secure remote access, vulnerability management, and incident response. CISA specifically emphasizes asset inventory, segmentation, controlled remote access, monitoring, and risk-based patching rather than relying on a single product.

My 2026 shortlist

Current industry comparisons similarly put Dragos, Claroty, and Nozomi among the leading OT-native choices, while Microsoft, Tenable and Palo Alto are attractive when integration with an existing enterprise stack is a priority.

If I had to pick one

I'd shortlist Dragos first for a serious ICS/critical-infrastructure environment. Its platform combines OT asset discovery, vulnerability/exposure prioritization, ICS-specific threat detection, network monitoring, threat intelligence, and incident-response capabilities. It also emphasizes passive monitoring designed not to disrupt production and supports hundreds of industrial protocols.

I'd choose Claroty instead if your problem is broader than traditional ICS—for example, manufacturing OT + building systems + medical devices + IoT—and you want a unified cyber-physical asset/exposure platform.

I'd choose Nozomi if you have many geographically distributed sites and need centralized OT/IoT visibility and monitoring.

The architecture matters more than the vendor

A good OT program should look roughly like:

OT asset inventory → passive network monitoring → segmentation/firewalls → secure jump hosts + MFA → vulnerability/exposure management → ICS threat detection → centralized logging/SOC → incident response + recovery

In particular, don't put an IT-style vulnerability scanner directly against sensitive PLCs and controllers without evaluating the operational risk. CISA recommends risk-informed patching and testing, segmentation between IT and OT, and controlled remote access.

If you tell me your industry (manufacturing, energy, water, pharma, etc.), approximate number of sites/devices, major PLC/SCADA vendors, whether you have a SOC, and your budget, I can narrow this to a specific 2–3 vendor architecture and deployment plan.

There is no single "best" OT/ICS security solution because industrial environments vary wildly—from a water treatment plant with legacy PLCs to a highly automated smart automotive manufacturing floor.

Instead, the market is led by specialized Cyber-Physical Systems (CPS) Protection Platforms and industrial networking giants. Selecting the right one depends on whether you prioritize deep passive asset discovery, active threat hunting, network segmentation, or cloud-managed visibility.

The top-tier solutions recognized as industry leaders break down by their core strengths:

• Claroty : Renowned for unmatched depth in asset discovery, vulnerability management, and secure remote access tailored specifically for healthcare and industrial environments. It excels at giving a unified view of both IT and extended IoT/OT assets.
• Dragos : Built by ICS/OT practitioners, Dragos is widely considered the gold standard for deep threat intelligence, forensic anomaly detection, and incident response in heavy critical infrastructure (oil & gas, electric, manufacturing).
• Nozomi Networks : Highly praised for massive scalability and real-time operational visibility. Nozomi provides exceptional passive monitoring and protocol parsing across complex, heterogeneous industrial networks without risking plant uptime.
• Microsoft Defender for IoT : A powerful choice if your enterprise is already deeply embedded in the Microsoft Azure / security ecosystem. It offers streamlined integration between corporate IT security operations centers (SOC) and plant-floor OT monitoring.
• Armis : Exceptional if your biggest challenge is "shadow IT" and unmanaged connected devices (IoT, medical devices, and building management systems) sprawling across your operational footprint alongside traditional ICS.
• TXOne Networks / Fortinet / Cisco : Ideal if your primary need is enforcement and protection (such as ruggedized industrial firewalls and micro-segmentation) rather than just visibility, allowing you to safely isolate vulnerable, unpatchable legacy controllers. [1][2]

To help narrow down which platform fits your environment, could you share:

• What industry are you in (e.g., energy, manufacturing, water, pharma)?
• Are you looking primarily for visibility and monitoring , or active network enforcement/firewalls?
• Do you have a preference for on-premises deployment versus cloud-managed?

When it comes to securing Operational Technology (OT) and Industrial Control Systems (ICS), there is no single "best" standalone product because industrial environments are uniquely fragile, diverse, and mission-critical. Instead, the market is led by specialized Cyber-Physical Systems (CPS) and OT security platforms, each shining in different operational areas.

The top-tier OT/ICS security solutions break down by their core strengths:

• Dragos : Widely considered the gold standard for OT threat intelligence and deep industrial protocol parsing (supporting 600+ ICS protocols). Best if your priority is specialized threat hunting, rigorous incident response, and proprietary visibility into adversary behaviors targeting industrial stacks.
• Claroty : Exceptional for enterprise-scale cyber-physical systems (CPS) visibility and breadth of coverage. It bridges IT and OT security exceptionally well, offering deep asset discovery, vulnerability management, and secure remote access workflows.
• Nozomi Networks : Renowned for massive scalability and continuous AI-powered anomaly detection . Nozomi excels at high-speed passive monitoring across sprawling global infrastructures (oil/gas, manufacturing, utilities) without disrupting sensitive legacy PLCs or RTUs.
• Microsoft Defender for IoT : Ideal if you are already deeply embedded in the Azure/Microsoft ecosystem . It provides agentless monitoring for OT/ICS devices natively integrated into enterprise security operations (Microsoft Sentinel/Defender XDR).
• Ordr & Armis : Excellent agentless asset discovery engines that map everything connected to the network—spanning medical devices (IoMT), standard IoT, and deep OT—focusing heavily on behavioral profiling and automated microsegmentation policies.

Choosing the right solution depends heavily on your specific operational constraints:

To help narrow down which platform fits your environment best, please share:

• What industry are you in (e.g., manufacturing, energy, water/wastewater, healthcare)?
• Are you leaning toward passive monitoring only , or do you need active vulnerability scanning and enforcement?
• Do you already use an enterprise SIEM/SOC platform like Microsoft Sentinel, Splunk, or CrowdStrike?

There is no single “best” OT/ICS security solution for every industrial environment. The strongest programs usually combine passive asset visibility + OT threat detection + segmentation + secure remote access + incident response rather than relying on one product. OT security has different priorities than IT security: safety and uptime usually come first, and many PLCs, HMIs, and legacy systems cannot tolerate agents or aggressive scanning.

A practical shortlist of leading solutions:

Elisity CIOPages## My typical recommendations by scenario

1. Manufacturing plant (PLC/SCADA-heavy)

A common strong architecture:

• Claroty or Nozomi Networks for passive OT visibility and detection
• Palo Alto Networks or existing firewall platform for segmentation
• Privileged remote access controls for vendors and engineers
• SIEM integration for SOC monitoring

2. Critical infrastructure (power, water, pipelines)

Prioritize:

• Dragos for OT-specific threat intelligence and response capability
• Claroty or Nozomi Networks for continuous monitoring
• Strong governance aligned with frameworks such as NIST SP 800-82 and ISA/IEC 62443

3. Microsoft-centric enterprise

Consider:

• Microsoft Defender for IoT + Sentinel
• Add OT-specialist tooling if you have complex industrial protocols or safety-critical operations

4. Smaller OT environment

Avoid overbuying. A good starting stack is often:

1. Passive OT asset inventory
2. Network segmentation
3. Secure remote access
4. Backup/recovery testing
5. Monitoring and incident response procedures

Capabilities I would require in an OT security platform

Before choosing a vendor, verify that it provides:

• Passive discovery (does not disrupt production)
• Industrial protocol support (Modbus, DNP3, EtherNet/IP, PROFINET, OPC UA, S7, BACnet, etc.)
• Asset inventory down to PLC/HMI/firmware level
• Risk prioritization tied to business impact
• Network anomaly detection
• Segmentation recommendations/enforcement
• Secure vendor access
• Air-gapped or restricted deployment options
• Integration with your SOC/SIEM

CIOPages## If I had to create a general enterprise shortlist

For many organizations, I would start a proof-of-value comparison with:

1. Claroty — broad OT security platform
2. Dragos — strongest OT threat intelligence focus
3. Nozomi Networks — strong distributed OT visibility
4. Microsoft Defender for IoT — best when Microsoft ecosystem alignment matters
5. Palo Alto Networks — strong if you already use their network security stack

Elisity PeerSpotThe “best” choice depends heavily on your environment. If you tell me your industry (manufacturing, energy, water, pharma, etc.), number of sites, PLC/SCADA vendors (Rockwell, Siemens, Schneider, Honeywell, etc.), and whether you already use Microsoft/Palo Alto/Fortinet/Splunk, I can narrow this to a recommended architecture and vendor shortlist.