Autocar wants to know which luxury 4×4 is better in off-road conditions. They’ve already come to the conclusion that the Range Rover is more comfortable and refined, but not as quick on the road as the Porsche Cayenne Turbo. In their head-to-head off-road race test, we’ll find out just how quick these uber-4x4s are when faced with a very wet and slippery grass bank. Can the Range Rover’s off-road technology defeat the power of the Porsche?