I personally would never use crossed drilled rotors for offroad/mud.

A good set of quality rotors and pads is all you need, mostly everything else is marketing or snake-oil for this application IMO..

I see some logic with slotted rotors to give debris an escape, but I can never bring myself to spend the extra money..... ive lifted and offroaded a lot of vehicles and have never needed anything other than quality rotors.

Now when I went up to 36-37s on my Silverado I was eyeing up a +1 brake kit to increase the diameter of my rotors to gain back some of the lost mechanical advantage.