The main differences I've heard of aside from what you already mentioned; Kbin supports microblogging a-la Mastodon with the same account, and protocol-wise it maps upvotes to boosts so everyone looking at your "timeline" can see which posts you've upvoted. Both being turn-offs for me.
I really want the Fediverse to succeed as an alternative to content silos like Reddit, but at this rate I think that we're headed towards a world–like every other time Reddit fucked up–where a small number of people splinter onto different websites while "normies" stay on Reddit and continue to look at the funny memes be they posted by bots on badly moderated subs or not.