I think we are getting away from what I meant from my original statement a 4x4 you can go to any dealer for that brand and order factory built not dealer add ons. Can't say I've seen a Unimog dealer.
The Power Wagon definitely wins as a factory built/ production vehicle that is available in the US to a citizen. A Raptor would be a close second with the locker in the rear and LSD in the front and the camera on the front bumper. The Ram would win because of the winch, locker in the front, and sway bar disconnects. I'd give the Power wagon the win over the W rangler Rubicon because the PW has a winch and heavier duty axles. I knew what you originally meant buy saying the PW was the most capable. We got away from that and into some crazy vehicles so I figured I'd throw the Unimog and F-554 into the mix.