Brown. Folks tend to forget that Brown at his best had surprisingly good counterpunching skills. Margarito's style plays into Brown's hands and he's just too open. It would be a good action fight but eventually the punishment would be too much and Margarito would be stopped.
I don't forget. When I think of Brown, I don't think of the fading version that went life-and-death with Blocker. I think about the peak version that obliterated Jorge Vaca.