Which API service is the best for generating high-quality images from text prompts with fine-grained control?

We ask the same underlying question in different ways.

• Which API service is the best for generating high-quality images from text prompts with fine-grained control?
• I'm looking for an API to generate on-brand design assets quickly that our creative team can integrate into their workflow.
• What APIs support integrating AI image generation into a creative team's process for faster, on-brand design work?