First of I'm a boxing not a specific fan to a single fighter, i may sound like i'm bias to Mayweather cause almost every effing one of you hug Pacquiao's nuts so hard it'll eventually fall or you just hate Mayweather's guts for his cockiness or swagger.
yes Pacquiao beat the hell out of Cotto in a
CATCHWEIGHT bout @ 145lbs for a 147lbs Title. While Mayweather is gonna step-up and fight Cotto at his current weight "a legitimate weight" at 154lbs like he did against with De La Hoya. if Mayweather wins it's going to be 8 World Titles in 5 weight divisions. While Pacquiao will fight Bradley (a 140lbs fighter) at 147lbs, Bradley is the one stepping up.
here's my deal with Pacquiao: 3 of his last 4 opponents weren't worth fighting, only Marquez deserved it and probably beat him but that's another story. And now he's going to fight Bradley over Mayweather? Bradley is a great fighter but nothing special there and he vacanted his title so he can duck Amir Khan!
i'm not blaming Pacquiao solely for not making the Fight of the Century to come true but also his camp especially Bob Arum! They all knew Mayweather will be in jail in June and they're offering the fight should happen in a later date in a bigger venue so Arum can profit more from the fight!
Why Mayweather vs Cotto is better than Pacquiao vs Bradley?
ummm cause it's Mayweather and Cotto fighting each other

haha it ain't a one sided fight than the other one where you already know who's gonna win...