I'm having fun exploring the fediverse and learning how this all works. There is a decent amount of chatter on lemmy already which adds to the joy of scrolling.
I have found myself getting into an unfortunate loop where if I'm on my lemmy I accidentally end up on another instance and then get all lost at how to follow a community on another instance. Lemmy also seems to load really slowly for me, but that's not the end of the world.
Kbin solves a lot of these issues even if it's generally rougher around the edges. Having a clearer "front page" without getting lost in instances and communities helps a lot. Everything loads faster and I don't end up unable to interact after clicking a link.
That's my pretty initial reactions. I'll go play with it all some more and probably have a better feel later!