Pitbull vs. boxer/bulldog mix?

Alrighty, me and my friend are debating which one of our dos would win in a fight. we are not planning a fight because that would be cruel and illegal, i have a 1 1/2 year old purebred Pitbull, kind of tiny, 60 pounds, and my friend had a 4 year old 110 pound boxer mix. who would win? and again i would like to state we are not ever, ever planning a fight. im so apposed to dog fighting.