Why use drilled or slotted discs?
Drilling or slotting discs aids the disc in several ways:
The edges of the slots or holes continuously clean and refresh the pad surface as well as providing increased brake "bite". Additionally, they prevent gasses from collecting between the pad and disc interface.
The disc is lightened, thereby decreasing its rotational inertia.
Improved ventilation increases the disc's ability to shed heat, resulting in cooler operating temperatures


IMO I used OEM and brembo rotors (which i currently use)
the brembo have lasted much longer than the OEM rotor (which i replaced because they warped at 12,000 miles) so far i have put 28,000 miles on my brembos and they barely have any warping.

people say dimple drilling is better because it "does the same thing as drilling but does not affect the integrity of the rotor." As the pads closes on rotor, a drilled hole would let the rotor and pad contact as better opposed to a dimple drilled rotor.. my reasoning? as the pad closes in on the dimple, it can create an air pocket in that area, which could be slightly pressurized, going against the force of the pad. Also holes are meant to "shave" a layer of the pad giving some fresher unglazed surfaces of the pad to brake with. The residue would flow out of the hole in a drilld rootr.. what about dimple drilled?

as far as drilled rotors cracking, I never "broke in" my brembo rotors, even by stupidity ran my pads down to the metal and braked with them, and they have not cracked nor has the surface been fuct up