If the purpose of the question is to find a winner and a loser, that is subjective and depends on many factors - I will not digress to that. Rather, will give you my summary impressions, having owned both.
BMW 1200 GSA - solid, heavy, steady and reliable - my ride for over 20,000 km of Soviet Union adventures.
KTM 1190 Adventure R - fast, nimble, a few tweaks needed - so far a fun ride of over 3,500 km in the Caucasus.
It is not about the ride, although IMO, a bike is the key ingredient to a great adventure - it is about the adventures which pop up along the ride - and both bikes are more than capable mounts to take you to the unexplored.
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