Look, read up on brake rotors -
General statements: Slotted helps with degassing (which is brake fade), but drilled helps with cooling (not so much on degassing, but it does help). Best bang for your buck is slotted, but not drilled (drilled rotors are somewhat more brittle, YMMV). For 4X4, prob best is at least slotted. Drilled is prob marginally better, you decided. Mucho debate on slotted/ vs drilled /vs both vs one or the other....
At any rate, slotted is better than stock, and drilled/slotted is better that slotted only. Search on pads; lots of info on them (DBC is prob best $/bang).