As others have said,depends on the angle you look at it from.
Pavlik lost to a legend, who had a very clearly defined game pla to beat him.
Cotto got flat out whupped.
As far as who bounces back better,it really depends on which weight class they ply their trade in,and wether or not the flaws Margarito and Hopkins capitalized on can be made to go away. Because you know every future opponent they'll have is looking at those tapes.
But at 28 and 26, I see no real reason why they couldnt both rebound nicely. You never know how a guy is going to deal with a loss. Mancini was probably better after losing to Arquello,Tyson never looked the same after Douglas