HMM, this is a tough one. MegaGirl has a much better fighting and stamina, as well as more determination. But Boris having more strength, agility, and intelligence possibly evens out or beats that. If MegaGirl were able to get up close, I'd bet she'd win pretty easily. But Boris seems like he'd be more apt to get into a ranged confrontation, and the higher iq might allow him to put the battle on his own playing field, so that combined with his better range abilities, I'd say that'll give him the victoly in this one.