Prettier could really use some example inputs and outputs for the supported languages. Sure, all of the settings appear to be documented in the API, but there's no concrete examples. I'd like know if its defaults look reasonable to me. I've seen some weird JavaScript conventions which makes me leery (e.g., jQuery). And I don't even know what that JavaScript/HTML hybrid is in the "Playground".
Briefly: there's _tons_ of style things eslint can't even warn about which prettier will just automatically fix. Most dramatically, eslint doesn't know how to wrap long lines.
Also, though, eslint offers a bunch of non-style code correctness checks, which is something prettier doesn't even try to do. So the general advice is to use eslint with all the style rules off, and use prettier to handle style.