For most performance applications slotted is the preferred choice.
For many years most racing rotors were drilled. There were two reasons - the holes gave the "fireband" boundary layer of gasses and particulate matter someplace to go and the edges of the holes gave the pad a better "bite".

Improvements in friction materials have pretty much made the drilled rotor a thing of the past in racing. Most racing rotors currently feature a series of tangential slots or channels that serve the same purpose without the attendant disadvantages.

So yes, for a tracked car you will see better braking performance with a drilled or slotted rotor. Car makers (Ferrari,Porsche etc..)do not just haphazardly put drilled and/or slotted rotors on their performance cars just for looks!

Thanks for for the correction on the dual piston.:thumbup: