It supports all major models and has a native Mac UI, and as far as I can tell there's nothing faster for generation.
The "best" models, and a bunch more, are built-in. The state of the art is FLUX.1, "dev" version for quality, "schnell" version for speed.
SDXL is an older, but still good model, and is faster.
For models, Flux [2] is pretty good and quite straightforward to use. (In general, you will have a runtime and then you have to get the model weights seperately). Which Flux variant depends on your graphics card, the Flux.1 schnell should work for most decently modern ones. (And the website, civitai.com is a repository for models and other associated tools.)
[0] https://github.com/comfyanonymous/ComfyUI
Flux has been very popular lately.
Pony is popular especially for adult content.
SDXL is still great as it has lots of folks tweaking it. I chose it to make a comic as it worked well with LoRas trained on my drawings. (article on using it for a comic here https://www.classicepic.com/p/faq-what-are-the-steps-to-make...)
download models and all vae files for the model, put in right place, run batch file, configure correctly and then gen images using browser.
A1111 is a good place to start. Very beginner friendly UI. You can lookup some templates on Runpod to get started if you don't have a GPU.
someone else mentioned a local setup which might be even easier