A mate of mine had a G230 vs my 110 and another mates 90. At pure off road the Defenders were generally better as the G has less axle articulation and ended up teeter tottering a few times despite having axle diff locks. Also heavier so sank easier in mud.
Well built (hand built by Puch Steyr) but still prone to rust on the back corners over the lights. Easy to work on. Same as a Defender onroad. Defenders and G’s are cramped in the back as stated above.
G specific parts were pretty pricy but joining (£) the UK G forum gave parts cross compatibility to common Merc models. Don’t be seduced by cheap LR parts prices – most places deal in britpart which are cheap but utter gash. You HAVE to find OEM sourced parts or reliability will suffer.
However its all irrelevant as £10k buys nothing UK G wagon wise, and doesn’t go far Defender wise.
The other options are an ex utilities Sprinter 4×4 – which can be had for around the £9k mark but would need extra seating fitting, looking in Germany via mobile.de where G’s are cheaper or a LWB transit.
I run a MK7 Transit and ride quite a bit at BPW and AnturStiniog so end up nattering to the lifties about Tranny reliability as BPW especially absolutely hammer their vans up rough fireroads constantly although they do have short service intervals. Apparently they get through a lot of side door handles, rear leaf spring bushes and front TRE’s, one of BPW’s had a gearbox but are generally good.