I suspect the primary difference is initial RR cost, which is much higher. That places the RR into a class of owners who rarely take a vehicle off road. .
This is basically true but in 2007 I sold my practically new Supercharged full size Range Rover and bought an LR3 simply because of it's vastly superior practical design and shape. There is no comparison really when it comes to the interior volume and its usability. The LR3 is so much better in this aspect equal to how much more awesome the SC RR is in its engine and wonderful ventilated seats and trim. However, when you need to haul things that take up space, the LR3/4 simply win by a wide margin.
For example, today I was able to haul the following inside my LR3:
1 boxed Panasonic 50" Plasma TV standing upright on starboard side
2 mountain bikes upright with seats and front wheel off (also inside)
2 accompanying mtb "gear" bags
2 40L day packs
1 tool case
1 40L ARB fridge set to standard refrigerator temp (set into the removed 2nd row center seat slot)
1 37L ARB fridge set to below freezing (set into the 2nd row port side removed seat slot - both running off supplementary 12v sockets powered by the 2nd battery, an Odyssey 2150 in the engine bay on the port side)
2 50L clothing duffel bags
1 REI 3 person tent, 2 24" wide closed cell foam pads, 2 3.5" 24" wide REI camprest deluxe air/foam pads - love those!
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1 medium size camera bag
1 running hydration pack
1 gallon water
Nordic travel waxing kit case (22"x18"x8")
1 crate of fresh organic peaches from eastern Washington
In a ceiling system:
2 20" backpacking camp pads
1 fleece jacket
2 standard size bath towels
Below cargo floor level also with 3rd row seats removed:
2 "Chok-Tracs" behind passenger seat
full recovery gear kit where 3rd row feet would sit
48" high lift bar and high lift extreme lever, base plate, wheel lifter, misc between wheel well humps and 2nd row/3rd row "trough"
2 low profile camp chairs
2 aluminum low profile tables
1 large tarp
1 Bushranger X-Jack (Air bag type lifter)
I think that's pretty much it.... front seats fully moveable to 100% back and 45 degree recline if desired.
This is with one of the 2nd row seats still intact but the space saved by removing the port side 2nd row seat was not utilized in that it would have still fit under what was placed there.
A Range Rover with all the seats removed still wouldn't come close to this cargo potential. This was not even a maximum haul.