Slotting and/or drilling started due to the degasing of the pads. It gave the gas a place to escape and kept the pad in contact with rotor, sorta like hydraplaning, and kept a clean surface on the pads..... no glazing. That is where the performance improvement came from. Todays performance pads and high grade pedistrian pads don't suffer from this condition as methods to bond the friction to the backing plate have improved.
As for the warping problem, this is two fold. One, NEVER clean wheels with rotors hot and 2. ALWAYS TORQUE THE WHEELS ON. This becomes even a bigger issue with aggressive driving and the rather small 10 1/2 rotors used on the f/g bodies.
The advantage of bigger rotors is also two fold 1. is leverage, it's easier to stop a 13" wheel than a 10 1/2 wheel given the same speed and stoping device (caliper). 2. is swept area, thats where the larger surface area comes in, more time to cool off.
I would stay away from the drilled and slotted rotor. Besides, they like to crack.