My understanding is that for track use(performance), the slotted only rotors are more desirable. The cross drilled rotors and slotted rotors are better at removing water, but because of the surface area removed from all the drilling, they have slightly less stopping power than just the slotted. And at the higher temperatures inflicted at the track, are more vulnerable to heat cracking and warping. The quality of the steel and manufacturing of the rotor is the more important concern I believe(no cheap pirated China knockoffs). IMHO, and in attempt to answer your question, I think the Cross-Drilled & Slotted rotors would remove more water quicker than just the Cross-Drilled, and look pretty cool as well. Also, the quality Cross-Drilled rotors have the holes that are countersunk rounded.