The ZJ will ride the best and be the most comfortable, the XJ will only tow 2K lb unless you have the auxiliary trans cooler along with the heavy duty cooling package on the 4.0, and the TJ will be the best for all around 4 wheeling where you need clearance. The ZJ will climb the best.
They all have shortcomings. I would likely pick a ZJ in your position if I was out west, and didn't wheel rocks.
