It depends on your needs. The only real way to find the best rom for you is to try them yourself.
Personally, I find that all Android 11 roms for Poco M3 lack at least a few things I need. For example, double tap to wake does not work on all custom A11 roms. I just stick to the latest Xiaomi.eu stable rom. Yes it's android 10, but the good devs have included most if not all good functionalities from the newer versions of Miui.