Imagen is one of my favorites for generating photos with minimal prompting. It's got good prompt adherence and is fairly effective at generating some good images. I thought they were the best overall. I don't know what Meta uses but it works pretty well.
Dall-E was impressive maybe a few years ago, but I hardly ever use it anymore. There are simply better generators for nearly every kind of image I would want to create.
For the most part I use SDXL and various fine tunes/variants for SDXL, like Dreamshaper XL lightning, when those fail I also use Imagen 3.0 and it's fast variant, or Flux and Flux Schnell.
Really I'm kinda disappointed an open source image generator like Stable Diffusion XL wasn't included. Especially when Dall-E was. I'm not sure which version is free, but honestly I don't get great results from 3, or 2, and I haven't used the first in a long time.