The electronic woes are only on a certain era of V8 engined G500s, no such issues are present anymore. In terms of sheer strength of parts, let me tell you, having experienced both TLC and G extensively off and on road, the G would take far more pounding before it would break. Toyotas in South Africa generally crack their chassis far earlier than G. Only problem with G is its high cost of entry. The 2.7L diesel engine G is whats sold to NATO and MB sells it all over the globe except here in US sadly.
While I may not have seen or read what you've seen or read, I would tend to disagree with this based on my own experience (the cracked chassis thing). Toyota pickups/mini-trucks/Hi-Luxes? Sure. Seen 'em crack on the trail, seen 'em welded back up on the trail, seen 'em complete the trail. No major drama, and anyway, they're light-duty vehicles, so what would one expect? But Land Cruisers (real ones, not Prados)? I don't think so. Sure there may be an exception here or there, but in general, they are built every bit as tough as a G, and have been so for far longer. And there's a reason why they have displaced Land Rover and become the dominant work vehicle in Africa, Australia, the Middle East, and most other parts of the world.
I have owned and wheeled three Land Cruisers and two G-Wagens, so I have also experienced both, and both on and off road. While we don't have the corrugated roads they have in SA, we do have a whole lot of Sierra granite to ********** our trucks against...
I guess I'm just not into disparaging one vehicle to elevate another, I like to take each at its face value, objectively. That's probably why I've owned and continue to own both, and even can find value in Land Rovers and Jeeps <gasp>. I still own a 2004 100 Series Cruiser and a 1981 460 G. They are both great trucks and I would not hesitate to take either one around the world.
BTW, if what you say is true, it's amusing to me how the Germans now use a Toyota kieretsu manufacturer (Nippondenso) for some or all of their electronics (though I'm assuming/hoping there's still some Bosch in the current G-Class...).