I always thought Manny was slower than Floyd but after the last fight he might be a bit faster. As for power I think Manny has 1 up on him. For chin, Mayweather has not been tested so I cannot rate that. For overall skill Mayweather has him beat. For speed, Manny is up on that one. Reach and styles could matter. Mayweather has a longer reach and his style might make the difference. It will be a close fight. Hatton went quite a few rounds with Floyd but his movement and speed are not up to par with Manny. Manny has the best trainer in the sport right now too. That matters a lot. Also, looking at Floyds past few fights, he had an unimpressive win over an aged DLH. The DLH that fought Manny was not the same that fought Floyd though. IMO this fight will happen. I do want to see Manny win.
Manny will have to apply absolute relentless pressue on Floyd and hope that can disrupt a super slick technician, otherwise this will be a boring 12 rd. u.d. for Floyd. He needs to apply pressure like Duran did against Buchanan and yes I know Buchanan was no where near Floyds level, but that is one of the few times I have seen a brawler dismantle a pure boxer at this level.