A 1 ton will be heavier with heavier springs that ride rougher, probably a heavier frame, 8 hole lugs and either a 4.57 or 5.13 rear. It won't run as fast as a 1/2 ton. As far as desirable, it depends on if you like it. As far as value, a lot more people like a 1/2 ton, but a 1 ton is rather rare and people who are looking for them usually ay the price.
