I just found out they don't even have attachments as default.
Going by webhostingtalk's forums, all the threads I've seen have been in favour of vB for forum use. Same with theadminzone. phpBB doesn't get much of a mention due to lack of features and apparently security, although I haven't found anyone elaborating on the security side of things. Most of the threads I've read mention vB vs. IPB and few have phpBB in them, oddly enough. The general consensus seem to be pro-vB, although there are a few features mentioned that IPB has that I'd love. Inline moderation, mainly. Still, those are bonus features, and vB outdoes all others in that area. With regards to phpBB, without mods it's just plain crap. I guess Unne would go pro for it because of it being open source, though. If I wanted to hack a board, I'd still use vB - vbulletin.org has an endless listing of hacks that you can use for all sorts of things (including that elusive inline moderation).
The main thing, again, is the admin CP and the amount of control you have. If you're a simple person and want simple things, use IPB, sure. Hell, use the free version (is it still free, or did they change the TOS again?). If you have money, though, vBulletin is worth it, at least in my opinion (and the opinion of the majority of others). Not just because it has more features, but also because the average response time to problems is less than 30 minutes at last check, and "-1" coding or not, it still works, so what's the problem? To be honest, I wouldn't be surprised if it's possible without the -1 anyway. There are vB2 skins for vB3 available at vbtemplates (or something like that). Of all the online software/hardware/anything support groups that I've experienced (and there have been a heck of a lot, considering it's my personal support-type preference), vB are second to none.