The only other difference is slightly less of a rocking/swaying motion downstairs (due to being closer to the center of gravity/axis of rotation), so some people who suffer from motion sickness may prefer the lower level.

I do get carsick, especially if I read something and especially if I do so in the back seat, but I have never had an issue with motion sickness on a train, so you'd have to be very, very sensitive to motion for this to be a concern.