Trying out SnS and it seems to do more damage than my HBG, Bow, or any other weapon I've tried. I get under a mob, and hold Control so that I'm blocking, and then just spam left/right mouse buttons. I'm not pulling off any sweet combos, but I'm slicing and dicing like crazy. So it's not that SNS does more damage, but for my play style it seems to be doing a lot more damage.
Might try out Gunlance again, because that one is hella fun to be beating on a mob, and then decide to jack him in the face with a shotgun blast!