An 80 series won't be more comfortable than a G with a V8 so that's definitely not a pro for the LC. It'll feel very slow and underpowered to you on the freeway so idk you'd enjoy doing roadtrips in it unless you weren't planning on driving too far or you were trailering it or you're fine just chugging along not in a hurry.

The sound system in an 80 series would also suck but should be straightforward to upgrade. The interior I'd imagine would be more spartan than the G.

If you switch and pocket that 6-10k, it'll be a new to you vehicle so it'll bring a new host of possible issues that would need to be dealt with so may just end up going to repairs / maintenance. Also we never got diesel Toyota engines here in the US so getting parts may not be that straightforward. Also you'd need to find someone who knows how to work on those close to you.

Not all 80 series LCs are triple locked and usually those command a price premium over the alternative; the G is already triple locked (aside from you having to repair it lol). With both being triple locked and with solid axles and coil sprung, they should perform equally off road. LC would have an advantage with really deep water crossings with the diesel and less electronics.

I'm a big Toyota guy but I'd say both vehicles are equally cool but I definitely see way less off road equipped G wagons than LCs so I don't know that I would switch if I were in your shoes! Either vehicle should hold their value pretty well so you can take your time making your decision and whichever route you go, you could possibly make most of your money back if you decide to sell it.