I'm very enthusiastic about Dreamshaper XL Turbo, which works both for ComfyUI and A1111, and probably all other AI image generators based on Stable Diffussion.

It is fast, it takes only 6 steps to render a high quality image. It is versatile, supports many image styles. It does not need extensive prompting, simply tell it what you like to see.

Link to the workflows from the video:
https://drive.google.com/drive/folder...
If there's trouble with the Latent Upscale node, try this one:
https://github.com/city96/SDLatentU...

Link to video on ComfyUI Manager:
   • ComfyUI 03  ComfyUI Manager Install  

Large collection of upscalers:
https://openmodeldb.info/