Man this is a tough one, for real. While it's just stupid to underestimate or not appreciate Manny Pac, I am huge fan of Cotto and know he's a real deal WW. I just can NOT cheer against Cotto no matter who he's fighting (unless he takes on Pav one day, LOL). Good fight.
As much as I'd like Cotto to win, it's that problem that a lot of people seem to have facing Pac, the speed at which he throws punches and gets out. Plus Pac still hasn't been hit at these weights, so how he'd stand up to a Cotto punch is a grey area. Pac on points unless Cotto catches him.