Whilst I agree that both Marquez brothers are pretty great Im gonna say the Klitschko's (partly just to be different) but because while the marquez's are really good and possibly both top P4P fighters they dont dominate they're divisions quite as much as the Klitschko's. Ok partly due to a weak heavyweight scene but still a fighter can only beat the man in front of them and lets be honest who do you see more likely to lose anytime soon, a Klitschko or a Marquez?