Midjourney produces the most aesthetically consistent images of any generator, particularly for illustration, concept art, and anything with a strong visual style. It runs through Discord or its own web app, and the workflow is prompt-driven rather than canvas-driven, which suits people who can describe what they want but cannot draw it. A subscription is required with no free tier.
Where it falls short
Precise control over composition and text rendering is weaker than dedicated design tools, and commercial-use terms depend on your plan tier.