I've used a lot already (including vBulletin & IPB) but I find phpBB 2.0.23 the best one, the phpBB team might have stopped developping it, next time I will create a forum I will most likely use the phpBB 2 version.
The admin pannel has an easy-to-use interface, the 'profile' is much more simple than the phpBB3 script has and it has all-in-one. The template are much better for me too, they don't look so flashy like the ones from phpBB3.
vBulletin is really the best of the best, you can't find better stuff I think, the only thing is that it costs pretty much for a young entrepreneur. And IPB just sucks too much, I wouldn't try it at all