vBulletin is been used by many top sites.. IPB is good but when my big site was using IPB it used more resources than vB
I think vBulletin is better. I haven't used IPB much so can't comment on that but most of the popular forums use vBulletin.
I wrote a little blog on phBB vs vBulletin a week ago on wordpress if anyone is interested. vbulletin-vs-phpbb/. Sorry to thread jack.
I would go personally with vBulletin and have seen many of the popular forums powered by the same. Voted for it
There being repeated again, search the title or actually just look down at the bottom of the thread under simular threads.
I don't know much about IPB, but vBulletin is awesome. And "most" of the top forums are using it. Jens
This thread is like asking: What do you want for dinner, pizza or spinach. Only a total n00bie would pick IPB, aka spinach!!!
Would you not have have given Other as an option as I would have picked that, SMF to me is a good alternative to VB