I originally chose Kbin/Mbin over Lemmy because of the added support for Mastodon-like posts, but it's still suffers from wonky early adopter stuff. I still rather like Mbin's interface more than Lemmy's defaults, though Lemmy's support for third partyfront ends is very cool. Whichever way you go, I'm happy that Mbin and Lemmy have access to all the same content. Mbin could grow more if some of a magazine's custom CSS could federate to other instances, or if it supported bots like Lemmy.
Oh dang, I'm gonna have to look into PieFed, though. That looks good! I'd like to see how my community looks, but I think a registered piefed.social user has to do this community lookup for federation to begin.