Hello!
Ok, actually this is Off-Topic, but well, you can say it's a question about module.
My opinion: Don't use a module regardless of which forum, there are much more problems than advantages.
About "which forum is the best": Has nothing to do with WB, but which you like.
I personally don't like SMF at all, it is everything except WB-like... But well, it's personal favor.
The best forum for a very small community and expecting not really to grow is Vanilla. It is really easy and "good".
The best forum for a bigger community I think is phpBB3, it is much more complex as Vanilla but yet quite easy to maintain, quite secure and has excellent possibility to "style it easy" just with editing a few CSS entries.
The best forum for a really big community (>50.000 users) I think is vBulletin, but it is also the most complex one out there, and not free and OpenSource.
Another "compromise" (not as complex as vBulletin but easier to handle at first) would be the very easy editing but unfortunately not free and OpenSource WoltLabBurningBoard
3.
But sure there are many more good ones out there.

Regards Michael