I took one look at lemmy and was put off from it (no offense). I later stumbled upon kbin and liked kbin for kbin. and the first few days i was here federation was basically entirely offline. helped really get a feel for things. The ui is cozy and it's more or less what I'd want from social media. the various lemmy instances are kinda.... not great in terms of the ui.
as for why kbin.social in particular... it's the biggest kbin instance and the "main" one. I also made a fedia.io account but I don't use it.