A friend here in Cabo bought a totally loaded rubicon last year. It is really nice, with insane suspension all the bells and whistles, but on a short trip down the highway towards an off road trail, I could barely keep from wearing my cup of coffee. That wheel base is so short I could only imagine how it would feel sitting in the back seat! They are very nice rigs and off-road capable, not to mention that they do come with more ground clearance that a stock hummer. Not sure how they compare on approach angles, but would guess they are similar. As it was said earlier in this thread, these two vehicles are not really comparable, since the jeep is not really that practical on-road.
That's my .02
