what works best slotted, cross drilled or drilled and slotted?
Slots and holes are no benefit until the brake temp gets to about 800 degrees. Most SD brakes never get over 500°.
Racing pads outgas / fade at 800 degrees. Most stock pad materials will show signs of fade as low as 300 degrees.When the temperature at the interface between the pad and the disc exceeds the thermal capacity of the pad, the pad loses friction capability mainly due to out-gassing of binder (matrix) materials in the pad compound. The brake pedal remains firm and solid but the car will not stop no matter how hard you push on the pedal. The first indication is a distinctive smell, a signal to back off. Solutions: better cooling, higher mass brake discs size and vane configuration or higher heat range pad compound.
I don't think you will find any legitimate data that shows the OE brakes on a SD fade at 300°. There is some stuff in that article that you linked that is incorrect or not applicable to a SD. I think FMTRVT commented on that article several years ago. You should be able to find his comments with a search.Most stock pad materials will show signs of fade as low as 300 degrees.