Fabian Stelzer recently made an image comparison test between three artificially intelligent (AI) text-to-image generators: DALL-E, Midjourney, and Stable Diffusion.
AI Image Generators Compared Side-By-Side Reveals Stark Differences

Stelzer published his findings in a Twitter thread where he explained the process that involved giving exactly the same prompt to each machine and using a 1:1 aspect ratio.