I'd have to say a pre 90 Range Rover, modded they kick arse. Coming from a family of Jeep owners, except myself, these things in stock form will always outperform an stock X. Add lockers to both and the Jeep will still go farther. SAS and the Jeep will still go farther (tire size limitations on the X, and axle limitation). Warranty running out on both and the X will go farther.