Chapo. Though the longer it goes, the better for Corrales chances. But I think Rosario would simply be too powerful and he'd bomb him out within 6 rounds.
I don't think Corrales could run his way to a decision victory like Camacho did. He'd certainly have a chance to win by KO though
I think Rosario stops Chico. Both big punchers and very good fighters, but Rosario was better and has advantges in chin and especially foot speed.
I picture this as possibly having a Rosario-Ramirez type outcome - Corrales survives some rocky moments and perhaps a KD or two early, finds Rosario's chin to turn it around, and then doesn't let up until El Chapo is done.