smaller diam rotor = less bottom end and more rpm - very free running off-power, weaker brakes(but you have to gear it lower)
large diam rotor = more torque, less rpm + much more drag brake, killer brakes! (so you gear it higher)
if you changed rotor without changing gearing the change would be pretty massive, but the change in gearing normally makes the change less noticeable
I think the main thing is the amount of bottom end rip you get with a big rotor and the amount of brakes both drag and pull back brakes with a big rotor, some like it, some don't
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