Holes are evil. Rotors prematurely crack at the holes.
Slots are more of a pad cleaning thing than much of anything else. You see holes and/or slots on high end street cars purely because of marketing. Same is true of wilwood rotors, marketing delivers what the average, uninformed customer wants.
Modern pad compounds actually transfer an extremely thin layer (read: invisible) of pad material to the face of the rotor.
I've heard very good things about having the rotor cryogenically "heat"-treated. Both in braking performance and in life-span.
Better or improved braking comes from, in order of importance:
1) Good pad compound that is well matched to the use.
2) Larger rotor OD
3) Improved airflow to cool the rotors in the correct way (can do it wrong easily and damage them)
4) Extremely rare cases, a larger caliper piston area.
