mine is a completely uneducated view to be honest...

SRR has the reach, power and size advantage...
Floyd has speed and defence...

as ive only recently got into boxing thoroughly ive only seen a handful of floyds n maybe a couple of SRR's fights!

i think before i could personally pick one here id need to see how floyd's chin is...
hes pretty untested in that respect and im failry sure SRR would catch him...i just cant say how much it would affect floyd until i see him caught flush more often.