If you have them upholstered, make sure to tell the guys that the area in which they will be tucking the fabric is by far the weakest part of the door panel. It does not take much to start a crack there, and a careless upholsterer could crack it very easily.
The suede they used from the factory was used for a reason. It was a good reason, but there are drawbacks. Given that this is a common armrest area, and given that it is flat, and directly adjacent to the window, anything else would get very, very hot during the summer. Some other cloth materials would work as well, but I personally wouldn't want leather there. It is also less reflective than other materials.
If I recall correctly, it's Alcantara that is used on the door panel tops. Alcantara is a synthetic suede used by a few manufacturers, including Ferrari. By the yard, it can cost even more than suede. The advantages are easy forming, weather resistance, U/V resistance, and good aging. Unfortunately, despite the fact that it is considered very durable, it just won't hold up like other things when the highly stretchable version is selected and pushed to it's limits. It is just too thin and light weight.
It holds up very well when the heavy stuff is used for seats, and I imagine that's what Land Rover was imagining when they selected it.
As for what they actually did use, it makes a better headliner than it does an armrest. Looks nice, though.
Cheers,
Kennith