this question isn't even fair. Peter and Harry wouldn't fight each other if you paid them. No matter what, they'd end up on the same side. if forced to face off - they'd just have an epic staring contest or something.

Now, if you bring infriga_forzare in - the fight would last a while, but i think it's a coin flip on which wily bastard gets the lucky shot in. even then, if Peter wins, it's by accident and he'll feel shitty about it b/c he doesn't wanna kill people.