Ortiz would give Cotto trouble, probably hurt him with a few quick hard shots up the middle of his guard he doesn't see coming, but he jabs and breaks down Ortiz to get a late stoppage or violent decision.
Current Cotto would not be able to handle the pressure. Ill go against the grain, Ortiz by early to mid K.O./T.K.O. I say Ortiz buzzes Cotto early on then similar to sat, a backpedaling Cotto is a vulnerable one.
Its hard to say who would win because they are similar. I would have to put my money on Ortiz based on his youth and how strong he looked at WW. I think tecnically Ortiz might be the better boxer too. Its very close but i think he edges it in that department along with power and speed. Very close in everything though.
Go watch MMA then. Cotto is everything a boxer should be. Fights anyone anywhere and always gives a good show.