If Mosely looked like he did against Mayweather (IE without Steroids) then I would say marquez. That is IF Shane didnt come in at 154 for a 147 fight.
my heart says mosley b4 early KO (the fight should be named "POWER ALONE WILL BEAT YAH" but it may end up like ODLH vs PAC the difference is that Marquez is a counterpuncher
Sorry, but Marquez doesn't carry the weight as well Pacquiao. Much like Margarito, Mosley struggled with Cotto's speed. Pacquiao's a different animal. I don't think Manny will be coming forward in this fight, I think he'll box Mosley early and really pour it on once Mosley begins to tire and Mosley WILL tire.