Not sure, Def looked like it had a decent suspension setup, the hummer is an animal in any off road situation, especially on them earth moving tyres, the 200Tdi Disco looked like it was running lift and lockers. Trick suspension and lockers can make anyone look good, same can be said too that it can get an idiot into a whole heap of trouble.
Driver ability is getting a bog standard factory vehicle through the rough stuff with nothing more than skill.