I had drilled & slotted on all 4 corners, but I put the Premier OE rotors on the back when my right rear caliper went. I was searching for info & saw all the plusses and minuses, and IMHO it really doesn't matter all that much on a purely street vehicle. The trade offs? Solid rotors = more surface area and stopping. The drilled & slotted = more cooling/water clearing, looks (if you can see them), and cheese graters for your pads. In street/Moab use? I really didn't notice too much difference.