I like Marquez by a close but unanimous decision. I think we'll see each fighter get knocked down. Pacquiao will be more aggressive like fight 2 and end of fight 3.
Mayweather will not fight a slick boxer like Trout for business and strategic purposes. Mayweather will fight guys that come toward him and are either naturally smaller (Guerrero) or slow (Canelo or Chavez Jr) but have big fan bases.