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For as much track experience I've had and seen, I can assure you cross drilled will withstand whatever any wannabe street racers can manage to put through. At the worst possible scenario I've seen cracks will form from hole to hole and once they connect it's time to replace the rotor. But that's after many cycle through 160 mph to 30 braking lap after lap.
Cayenne have cross drilled (actually they are cast) rotors standard. I think BMW just went cheap, that's all. Or they figure the targeted consumers group probably don't know the difference.
I personally prefer slotted, but cross drilled works for me too. The reason is simple when you really drive your car hard gas will form between the rotor and the brake pad. Which will drastically reduce braking power, having either slotted rotor and drilled rotor will prevent this.
Obviously BMW done their research and realized the 99.9% of the owners will just be stuck in bumper to bumper traffic and there is no need to spend the extra money.
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