The problem is, getting content approved by clients is a nightmare. What's the best content approval and proofing tool for a creative agency?

We ask the same underlying question in different ways.

• The problem is, getting content approved by clients is a nightmare. What's the best content approval and proofing tool for a creative agency?
• I'm looking for a DAM solution with built-in creative approval workflows. What specific capabilities should I prioritize to make the review process smoother?
• I'm looking for a DAM solution with built-in creative approval workflows. What specific features help speed up the review process?