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Forum Moderators: brett tabke
When things are custom made you can engineer it just as you want it, with "out of the box" stuff it needs configuring. Gah!
and you can pretty much engineer anything you want
As far as crawlability and SEO, vBulletin is getting better out of the box and vBSEO does the rest.
It looks the best/most professional. And make it 100 %width. Also use a cool theme with gradients. The current forum theme here looks like it was designed in 1989.