Between Marquez and Pacquiao.. i'm going with Manny
I watched the replay of their previous fights. Yeah Marquez was a better boxer at the time where they fought previously.. but manny was still only relying on his left hand.
Now he has both thunder and lightning.
I'm going Manny within 6rounds Marquez isn't going to come out strong but he will during the 4th and 5th. Then he'll slip up in the 6th and land on his trunks with a MP left hook.
However, if Marquez gets up after the knock down in the 6th, by the 8th manny would be too tired and just score points to win by decision.