I would assume that the India vs USA experience is going to play a part in much of this, both dealer experience and ebay. Additionally, my closest dealers are both BMW and Ducati which makes things easier since I pay the same rates for BMW and Ducati. My comparison for service would be parts, service time, and service interval.
Of course the rider comfort is going to be dependent on the rider; I hate my GS, the next guy loves it.
And the ebay or secondary market experience would be dependent on location as well.
2018 S1000RR "650ib Edition"