too many people put too much emphasis on the vehicle in stock form. if you ask me if two vehicles are even remotly on the dame page, even a jeep to a bronco, if they are stock, the tires are what will make a difference. a good mud tire will out perform a larger street tire on a vehicle with more clearence anyday of the week.
for example, we were out in my old roomates 78, it was lifted but he only had like 31's on it at the time, my buddy in his cherokee was there as well, with a slightly more aggressive 30's. we were just screwin around in the woods, more or les doing some scouting. all day long the jeep got around better than the bronco, and the bronco ended with a blown rear joint, and the jeep couldn't get him out. so we went home to get my bronc, i had 32" TSLs and i hardly even spun a tire on the way in, and very little on the way out, and i had a strap hooked to him. the swampers, while sure were a touch bigger, but not much, they had such far superior traction, thats where the difference was, not in vehicle design.
remember no matter how good your vehicle is for wheeling, traction is still the number 1 necesity, and that is all about the tires