Just joined this great and self evident information/usage web site for John Deere tractors. I have a 3320 as we speak with a front bucket, hydraulic snow blade and rake. I also have a JDX738 mower tractor which does a grand job cutting grass and gathering leaves when attached to a significant collection unit. Recent acquisition of several hilly and partially wooded acres convince me I need stronger tractor especially for the boulder collection ever needed around the place. Ah, to be honest I really just like power (used to fly "fighters" back in the day). Thinking of an immediate upgrade to a JD4420, 2014 model. 48 HP, HST, Industrial tires. Usage will be snow plowing (200 meter narrow driveway off 6 car parking area +); hauling large boulders and slabs of bluestone; an acre or two garden etc.. Mainly interested in the performance difference with the 48 versus 33 hp tractor.