Do you really think you'll get an honest answer on a UBB-only site. Same goes for posting this question on a vB-only site.
I would say everyone here will say UBB is the best. Just go to http://www.infopop.com and http://www.vbulletin.com and check out the features of both. Then take a test drive of each forum and decide which works best for you. By the way, UBB doesn't really compete with vBulletin, Infopop now has a product called UBBThreads which is more designed to compete with vB.
There's nothing vB has over UBB or UBBThreads. Pick one of those 2 depending on your traffic needs. www.ubbdev.com if you would like to continue modifying your code
These threads usually degenerate into bashing, which we don't allow, so Ima gonna close this thread out.
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