Alright....the old argument about pads......
YEs, drilled cools faster, but marginally.
The point of BOTH slotted and drilled is for gas release, cooling is a nice side effect.
I've heard everything on parts-for-sale pages from "reduces weight" to "cools faster" to whatever else. Rotors that heat and cool really fast would CRACK, that's not the point. When the rot's get really hot, superheated gases build up over the surface of the rotor, and in between the pad and rotor. This creates a superslick area (someone else on this site did a good analogy using hydroplaning) that reduces braking effectiveness. Obviously, if you're cooling the rotors, there's less heat (hence the drilled argument) but the quickest solution is to just give the gas (and pressure) somewhere to go so that there is contact between pad and rotor.
THAT is the primary advantage of both drilled and slotted, with some added cooling advantage with drilled.
Both styles cause greater wear (relative to a smooth rotor), and yes (big_ben is right) cross drilled can cause uneven wear.
happy hunting!(drinks)
