Yeah, okay, this thread hasn't been posted in for way long, but it's still on page one and all that so let me just drop my opinion here.
Between these two? Xenforo strikes me as over-complicated. It is the only forum software I've seen so far that actively slows down when there's more than a few posts on a page, rendering the (admittedly otherwise nice) post editor near unusable. At least, that's my personal experience, and one that repeats almost every day considering where else I'm active. I don't know Vbulletin all that well but surely if Xenforo is that bad...
