[thstone]

I have used multiple sets of solid, drilled, and slotted rotors.

For normal street driving, there isn't much difference between them. You can choose by price or by looks to get what you want.

For serious performance driving, the drilled rotors are by far my first choice. This is just my personal experience after using all three types on the track.

It could be a myth or all in my head and there might not be any true difference in braking performance, but I do know that I like the feel of the pedal modulation better with the drilled rotors. That much IS real.

The drawback is that track driving on drilled rotors will cause the rotor to crack out from the holes and will need replacement at every pad change. This typically won't happen on the street.