My company just started using XenForo, and we've been pretty happy with it. We're self-hosting on a cheap AWS Lightsail instance.

We really wanted to to like Dicourse, but everyone on my team found some little thing that really annoyed them ("why does it hijack ctrl-f?", etc.). It was death by a thousand cuts. XenForo is the most modern of the traditional forum platforms that I reviewed. Everyone just gets it.