slotted and or drilled rotors

Seems like most of the race applications have gone to slotted rotors, like you see above, in favor of drilled rotors. The slots do a better job of cooling without as much structural compromise.

For a street car, it doesn't matter. You're not heating the brakes enough or cycling them rapidly enough for it to be an issue. If anything, you lose a little braking area. Not a noticeable amount, but hey.

That said, I have drilled and slotted rotors on both my Challenger and my Duster. My Challenger has the 11.75" mopar disks, and I can say that I've run both the plain and the drilled/slotted version of that disk and have never noticed a difference on the street. I only have them because they were on sale at Summit. :D My Duster has Dr. Diff's 13" brake kit, and it just came that way. I don't avoid drilled and/or slotted rotors, but I don't seek them out either, and I don't pay more for them.

Also, some places won't turn rotors that have been drilled or slotted. It can be done, but not everyone will do it. Just food for thought.