The GX does fine offroad, but for a few quirks. I never liked the rear suspension, as it was always bottoming out into the bumpstops, my '03 had a nondefeatable traction control whereby if no wheels had traction (i.e., spinning) then the vehicle would "shut down", and I hated the gated shifter (i.e., non-intuitive - have to look). I actually did experiments between my '05 Outback XT and GX on slippery wet grass hills. The GX would shutdown - back down and get a running start, but the OBXT would spin its wheels a bit and proceed up the hill. Not confiedence inspiring, which is why I got the LR3.
This is an ironic post regarding turning off traction control specifically in how these new vehicles use braking of a spinning wheel to apply power to the non-spinning wheels. While this is an awesome way to deal with cross axle situations that would get us sitting stuck in an older Discovery 1 or 2, it does not help when we need to maintain momentum in sand, mud or snow if you could keep an axle locked.
The problem here is that we don't get to user lock the lr3/4, nor do we get to turn anything off. The above note about the GX, well, in the Land Cruiser you can user lock the center (when in low range) and you can also turn off the traction control stuff to allow powering through things. (The roll over air bag sensors also turn off when in low range or something like that - I do wonder what the LR3/4 does in this roll over sensor regard)
So, the Land Cruiser having user lockable center is nice but also on the LC you can add front and rear lockers of several types, with ARB air being one type for only $1050 per locker, $200-$300 compressor, + install labor if hired out.
While we're on lockers, the Mercedes G wagen apparently allows locking the center while in high range. Nice for loose gravel or snowy roads and it's cool "just because"

I haven't locked my Disco 2 in a while but I recall you can lock the center in high or low.
I think a lot of us like the mod-factor and going back to an older Discovery 1 or 2, older G (older just for price reasons), or Toyota models. All of these are easy to modify whereas our modern LR3/4 is such a PITA to change, yet we try our best
