I have been using both Mbin (Kbin before it) and Piefed quite a bit, and both are very good.

If you want microblogging capabilities and prefer the UI, Mbin is the way to go. If you want the most robust Reddit-like experience with a bunch of quality of life improvements over Lemmy but only one UI and no apps as of now, PieFed is gold.

I think PieFed is my favourite for the time being, as I like the UI and don’t care about apps.