Kaisen
Explorer
I realize the G63 may seem a bit over the top, but the G550 is plenty power and the same otherwise, in fact easier to set up for real use. The new RR however really is too softened for me especially with all the things like tire size limitations. I looked at one yesterday and they are quite cool and comfortable though.
On $100k AEV, I don't think I'd spend that much on one or the Earthroamer. I do like the Unimog based vehicles but then the $ is up another few steps as well.
I know you aren't into the new LC 200 but maybe it's the sweet spot on an overall package. Affordable but nice enough, rugged and reliable still, right in between the limitations for modifications with G being highly open to mods and Land Rover LR4/RR being less modifiable.
On the rovers you have the air suspension to "worry" about or be in trouble if it were to fail in any one of the system segments. On the LC you have reliable steel springs but still have the hydraulic KDSS system. Worst case though the KDSS leaks out and you have simply softer sway bar control on the way home.
The G also has computers but how likely is it the engine or transmission will give out on any of the 3 makes. I am however looking at these as 10-20 year vehicles, not just what would be cool right now or for a few years while under warranty.
In my opinion, and it's just MY opinion, if someone is considering the three you mentioned (LC 200, G550, RR) for real overlanding over the long term, the G will be quintessential 20 years on. The RR and LC will be relatively overlooked compared to other LR/RR and LCs through history. The G is the original, not something else coasting of the achievements of their predecessors. In 2025 we will look at Gs like we look at Defenders today.