There has to be at least 1 Stark kid who lives when the series ends, and tree form doesn't count.
So you think there's a greater chance of Sansa dying over Arya? I would think it would be the opposite.
He's older and therefore more spoiled. That and his parents were younger at the time so he got away with alot more....and also from the time he was born he was heir to all of Westeos. Pretty significant differences.