They have have different styles. Pac man is more agressive and tends to put more punches together whereas mayweather lately tends to pot shot. But in terms of who's punch gets to the opponent faster, its definitely Mayweather.
One Punch speed.. Floyd Mayweather.. Combination speed.. Pac Footwork.. Toss Up.. Speed of Mind.. Floyd "Money" Mayweather...
IDK pac looks faster but he throws combinations. I think the fast combos from him will matter more than who is faster overall because they are very close. I thought head to head Judah was slightly but obviously faster hands than PBF. Styles and defense will be more important than speed because they each have it. I think Pac might have some problems because he does bad against counter punchers and thats against ones slower than him, never been in there with one that can match him in speed and has better defense than JMM or Morales. Thats why I am picking PBF decision regardless of weight if they fight.
In terms of flurries of punching, Pacquiao. In terms of one punch speed PBF and PBF in terms of moving away and dodgin. But Pacquiao has that edge when it comes to the explosive speed.
Mayweather has quicker reflexes but Pacquiao has the faster hands, not only does he punch fast he punches hard at the same time.
it's a toss up that can be argued either way. Pac puts together some lightning fast combos. but PBF counters so fast they never see it. Like said above, only a fight between these will determine who it is. I have by UD.