When we bought my wifes Xterra, we also considered the 4 door Jeep Wrangler Unlimited and HUMMER H3. In my opinion, all 3 are outstanding with their own strengths and weaknesses. I like the fact that all 3 are serious off roaders. Obviously, the Jeep is the king of that catagory out of these 3, especially if you get the Rubicon. But, I'm honestly never going to be rock crawling at Moab. I just don't think I'll ever put myself into a position where it is beyond the capability of the Xterra 4x4 (since we do run true All Terrain tires). Since this is my wifes vehicle for daily use, the fact that the HUMMER had OnStar was a REALLY big deal to me. Automatic crash response. A guy I know had a terrible wreck in his Pontiac Solstice on a mountain road and nobody could get a cell signal to call 911. What they didn't know was, OnStar had already received the signal of the crash, and had help on the way. The cars built in cellular system has a stronger output signal than your hand held cell phone and was able to get thru.
In the end, we didn't buy the HUMMER because GM announced they were trying to sell the HUMMER brand to either the Chinese or an Arab investment group. Hell no. Those deals both fell thru in the end, but by then, we had bought the Xterra.
The Jeep just plain kicks butt. We both love it, but worried it might have been just a little too much for her to live with every day. Kind of like a Corvette vs a Viper. The Viper kicks butt, but can be pretty brutal to live with every day. The Corvette kicks butt too, and is easier to live with!
The Xterra has 265hp, and a 5 speed automatic. We can tow 5,000 pounds, and its been a good truck.
Again, I think any of these 3 are killer trucks....