Basically, it came down to 5hp vs. armrests and Dual Adjustable 3pt Hitch Leveling Links. I chose the HP.
I am satisfied enough with mine, you will not be sorry. Be sure and check your battery after the first few hours, my interstate battery leaked acid out the top. I replaced it with an AGM battery so I didn't have to worry about sucking acid through my radiator and ac coil.
The 4720 is also a heavier machine.