For me a major consideration of whether I'll travel in Y is being 6'4". If I am booking months in advance for vacation, I can most likely secure exit row seats, in addition to having time to recover after I land.

If I'm booking a few weeks before travel for business, exit row is very unlikely and will need to be able to hit the ground running to get my work done. Granted, travel is somewhat "optional" for my job, but if they didn't offer to fly me in J, which luckily they do, I definitely wouldn't opt to travel.