I was thinking about replacing the stock rotors and was wondering what the difference between blanks, drill slot and cross slotted rotors? Performance-wise.

 

if you are not racing, get blanks. slotted/drilled are primarily for guys who really heat the brakes up, as in autocrossing or other aggressive, long-term driving and braking. Plus, they wear your pads down quicker.

Or, slotted/drilled are for show.

If you are not worried about looks, and use the car as a normal daily driver, I suggest Blanks (OEM replacements)...