I am sure your brand new slotted and drilled rotor will stop better than my old blank rotor, but give me a new blank rotor agains a new slotted/drilled and I garruntee the stopping distance will be the same, if not better for the blank.

Do you know why they drill rotors???

If not... http://www.teamscr.com/rotors.html
"Crossdrilling your rotors might look neat, but what is it really doing for you? Well, unless your car is using brake pads from the 40’s and 50’s, not a whole lot. "
"The one glaring exception here is in the rare situation where the rotors are so oversized (look at any performance motorcycle or lighter formula car) that the rotors are drilled like Swiss cheese. While the issues of stress risers and brake pad wear are still present, drilling is used to reduce the mass of the parts in spite of these concerns. Remember – nothing comes for free. If these teams switched to non-drilled rotors, they would see lower operating temperatures and longer brake pad life – at the expense of higher weight. It’s all about trade-offs."