I'd think horses take more to the plains. Horses like to have unobstructed views, and unobstructed places to run. They don't hide so they have to run. They also need lots of grass as their digestive system runs quick and grass is pretty low on nutrients.
And they don't have the right hooves fir mountainous terrain.
Your question is one that can go one way or the other. I've owned horses that for the most part were mountain-goat types and would even find elevated places to graze with no rider. On the other hand I've had horses that would balk at even starting up a small rise. Having ridden trail rides in old Mexico, those horses are in mountainous country all the time and are amazingly sure-footed and have adapted to their terrain. Perhaps that the answer -- horses raised and ridden on flat land prefer it and mountain horses enjoy the climb.
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