SDXL is reconfigurable and completely flexible so really its the only tool in the game for pure creativity.
Also Automatic1111 is more centralized, so you have to wait for something to make its way in (or a pull request for it anyhow), whereas people put up their ComfyUI custom JSON workflows. So I am doing Stable Diffusion video via ComfyUI right now, whereas it has not made its way into Automatic1111.
Fun world we live in.
Considering the author of ComfyUI is called ComfyAnonymous and has an anime avatar it's very likely they're a 4chan poster too so maybe don't use that if it actually bothers you.
Both are very good tools for using this stuff on the cutting edge so I couldn't really care less what the authors do in their free time.
Also his rimworld mods are indefensible. A Kenosha mod about “peaceful protest” where exclusively black pawns continuously attack your colony? That’s racist bro! It’s only flown under the radar because rimworld is played mostly by individuals with ASD.
My experience:
Took 4 minutes to log in and do one generation. (Login to FB, then it took me through a process to merge accounts with Meta, which didn't sound good, so I restarted with 'sign in via email' which ended up doing the same thing anyway, I think. Then I was logged in, did the generation.)
My at a glance is that it's:
For image quality
1. Midjourney
2. Dall e 3
3. SDXL and this
For overall ease of use and convenience
1. Dall e 3
2. Midjourney
Of course, this is all biased personal opinion, and YMMV.