If you are looking for rock protection, I would stay away from the Smittys. I had them on my jeep for a couple of months and they tore right off of one of the supports as I slid down the first rock to make contact with them (freeway ridge with Infectious Off-Road). IMO, even though the Mopar Rubi rails are nowhere near the best, they are light years better than the Smitty product. Once again, for anything more than just rubbing the rails as you crest a dirt mound, get another product.
That was my first experience with settling for a cheap product just to have something. I have since grown wiser and now run the Pure Jeep sliders; A purchase I will only have to make once.
I now save for what I want, rather than just buy to have something. That is the worst mistake you can make while building up your jeep.