Oh alright this thread is PACKED with people who provide evidence.
Jesus, you can't post and say things like "Vince Owns" without explaining (cough stalker cough kid)
Squall would most likely win this match. Due to his advanced swordplay, and the fact that he has both projectile, and melee attacks, his fighting style would overwhelm vincent. Vincent has the guns, but not the close combat effectiveness. Maybe if Vince picked Squall off from afar, but chances are the bullets would just be deflected.
Close match, but Squall wins 7 times out of 10