kbin (at least kbin.social) has a nice little community, but we're holding on by a thread over there since we've been overrun with spammers and nothing is really being done to combat it. A good chunk of people have jumped ship because of it, but we're still trying to fight where we can.
I made an mbin alt, but I haven't really hung out enough here to get a proper feel of it. Honestly it feels like looking through a window to the rest of the fediverse. If there's any chill mbin (edit) instances magazines, I'd love to know!
Beehaw seems to have the most positive vibes, and I really like that. It seems small, but they're pretty active. I mainly enjoy their gaming community.
I think I interact the most with Lemmy, but that's probably because that's where most active instances are. You'll get a lot more different takes on there than anywhere else, some great, some not so great, but that comes with any site where you bring a bunch of people together.
Of course, these are from my experience and opinion. I'm interested to see others' takes.