Top.

More privacy, plus it's like living in a treehouse. Usually tops have porches that are secluded. I love sleeping on my porch when the weather is nice... couldn't do that if I lived on the bottom. I don't ever want to sleep on a ground floor, it would suck in the privacy department.

Moving isn't bad. Groceries? come on. Maybe if you buy 10 bags worth every day it might get annoying.