? much help will 3/4 ton make for ride quality comp to 1/2?

Ok guys after pulling it a few more times I have decided that I am getting a 3/4 ton. Couple questions now.

Looking at 2012 GMC 2500 crew cab 4x4 with 6.0 gas. Tell me how much different the 4.10 is compared to the 3.73. It seems there are a lot more used 3.73's out there. Also with the 2500, is the wheelbase longer than my Silverado 1500 crew? Longer bed? When climbing hills how will the different rear ends act?

Thanks guys I appreciate all your advice and knowledge.