Like I say depends where you live and what you want a vehicle to do. That old beemer is great if you don't want to look at it. Ugly trees grow BMWs ( particularly their motorcycles ) but they are built solid and thats why they make great overlanders.
As for Brit stuff being fussy, my Triumph seems to be built tough. All the Jap stuff I've ridden has fallen apart or got very tatty after riding through a winter or two. The newer Triumphs still look like new ten years on. My current bike is ten years old and still shines up good. And my old t100 is going great and its 45 years old. You don't see many 45 year old Jap bikes at the vintage rallys, but you do see a lot of Beemers, Harleys, Triumphs BSA's Nortons etc. All seem to last OK.