One word fixes the decision I guess
If you want the possibility to go off-road, every extra kg is way too much ==> both bikes you mentioned carry some weight youĎre probably going to hate if you do not follow the standard roads. ==> why would you do that if there are other options?
I did not check out carefully (as I probably should) but I guess the weight of these 2 is easily beaten by some other bikes even within the Triumph or BMW brands. The max speed at the big ones might be a few km higher but,... how important is that? (my experience tells me ďnot at allĒ, but i am speaking entirely for myself) driving 170km+ on a bike, whichever one, on a normal road is ..... you get it.
Just drive all options on &offroad, I cannot imagine, as an example the Tiger1200 is so much better on the road itís disadvantages off-road are being equalised by the advantages on road, (compared with as example) a tiger 800.
But, You have to drive it anyway
A) Tiger 800 Jet Black
B) Bobber black about 9.000 km ago
C) a backpack to be used with B) if you need a toothbrush AND a fresh t-shirt.
Please try to avoid C) as itís going to break your back on the long run.