Forrest by decision or stoppage in the second half of the fight. Margarito doesn't have Mayorga's hand speed, wildness or power. Margarito was much more predictable, and his wide looping punches come much slower. Forrest would pummel Margarito all night. Forrest wanted a piece of Margarito's arse after he came back from surgery, but Arum wasn't having it.
Forrest was around when Tony was hiding in WBO land...:deal Vernon would have used Margarito like a pinata.