Does anyone wonder what kind of training they do at the Mayweather gym to prepare for fights? Their camp is so mysterious and secretive.
It's impossible to know this. I would say both train in a way that works for them. I think with Manny's popularity rising every year along with his obligations as a congressman, he may be willing to take shortcuts which is no good.
Judging by their fighting styles (which is not necessarily an indication of how hard they train, but I've got nothing better to go by) I'd say Pac Man trains harder. Floyd fights in a very relaxed, low output style that does not require as much energy as Pacmans style of constant fast and hard combos.