Range Rover tires aren't deflatable? Or are you saying that because they come with 20"+ bling rims, the Rangie's lower profile tires don't allow for the kind of sidewall deflection you can achieve with tires on smaller rims? That is true, but even so the footprint of the Range Rover's tires is still pretty big. I would expect the differences in off-road performance between new RR and new Defender to be small when comparing two vehicles rolling off the dealership lot. The Range Rover, for all its luxury appeal, is a formidable off-roader if you apply its full potential. As a vehicle for an outdoors enthusiast it's not as practical, however.