Kbin includes some mastodon/twitter-like functionality. It also makes public what you vote for and the interface is subjectively nicer. It also have PWA support for the main websites.

However, it doesn't have app support right now. There's significantly more development on that front with Lemmy.

While I am posting from a lemmy account (because I didn't know about kbin when I made it) if I was to host one of the two it would be kbin. The reason is that lemmy has some hardcoded moderation things inside it that I disapprove of. I believe I should be able to say anything I want without fear of being censored on my own self hosted instance and this comes from a leftist, I don't want to use bad words to insult people, but if I want to use them in a different context I want to be able to. If I see an argument between a bigot and a fellow lgbtq and the bigot calls my comrade with a slur I want to be able to describe the situation using the exact words used. I think maybe it's a cultural difference thing, where I live using slurs in a context where we describe a situation rather than for insulting someone it's not seen as a bad thing. We don't give those words so much power and importance to the point that even just saying the words makes people gasp. I believe that censoring some words by default without even considering the context they are being used in doesn't help, I believe it just gives the words more power while we should aim to take power away from them.

Also kbin has a much prettier UI in my opinion.

For me personally, it's the cleaner (stock) UI

Found it first.