Extra features like (apologies for the run-on sentence) being able to see upvotes and downvotes on threads and comments like lemmy admins can, better integration with mastodon, every community has both a 'reddit-like' section like Lemmy/Reddit, and a 'twitter-like' section which as I mentioned integrates with mastodon via hashtags, we can block users, communities, domains and (soon) instances, we have a wide variety of user-style scripts via Tampermonkey to customize the UI (the base UI is also, subjectively, better).

Given its all federated, you also don't lose anything by using kbin since you have access to lemmy too. Plus the dev is just the nicest, hard working son of a bitch lol.

Only drawback is we dont have an API yet, so for mobile you're stuck with the mobile site, but the mobile site is also really good so eh. Once the API is up tho there's a few apps which have already said they'll support kbin as well, so that's a matter of time.