I think Floyd would knock Manny out in a toe to toe battle. At this point in their career's Floyds taken less damage so he could probably take more damage than Manny could who has taken alot of shots. Than theres also the fact that he is bigger and I suspect he has more power in his shots than Manny does. And lastly theres the fact that hes taller so he would have more leverage and Manny would lose power throwing upwards.