I think phpBB is the most widely used, there are thousands of smaller webmasters who cannot afford vB license, they use phpBB.
Also there are lots of forum hosting outfits that offers free phpBB hosting as a sub domain of their domains so its got to be phpBB.
But when you talk of serious forums, its vB. To some extent (i could be guilty of prejudice here) I don't rate any forum that uses phpBB very highly because I know all the agro that goes with running phpBB, if you have a very busy serious forum,the last think you want to worry about is constant worry about patching up your forum, all this come free with vB and you cannot say the same for phpBB.
I think only an accomplished hacker can run a large forum using phpBB problem free.
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