Well I’ve got some experiences with vBulletin, XenForo & WoltLab.
But just to be honest; I didn’t really like all these softwares which I’ve named here above, because they’re mostly not so comfortable for me personally right now.
TeamSpeak used in their old forum something like “vBulletin” which was the worst software I’ve ever seen, but in their time (year 2002) it was kinda the only one which was good to use.
After many years, new softwares like XenForo (2010) came out and WoltLab, IP somehow too…
However: I really like the new forum software which TeamSpeak does use right now. It’s way too modern and the design was great customized for TeamSpeak in general.
There are of course other communities who use this forum software, and they also got great experiences I guess. (e.g. cloudflare community)
And this forum has quite everything which it does need, or doesn’t it?
I don’t really see where the problem with this software is. We have everything what we need. And I’m also glad that TeamSpeak finally got his new forum after more than 18 years in the old forum, which looked so awful and outdated. This forum was a great step in my opinion right now.