Reading from the sales invoice: The tractor was $13,000 and the loader was $2,750. The tractor price was undoubtably lowered more due to the fact that the loader was involved. How much? I'm not sure.
Novice hit on another difference, independent brakes. That was another factor. Growing up on a farm I had the opportunity to operate 2 wheel drive tractors without differential lock. On these tractors it was essential to have independent brakes to contol traction. With row crop tactors the tricycle style front wheels could be turned 90 degrees left or right and with independent brakes you could literally turn on a wheel, which sometimes came in handy.
However, in use I find I rarely use the independent brakes on my 4115. If I am in a limited traction situation I push down on the differential lock first to get out of trouble. Also, four wheel drive comes in handy in limited traction situations.
Since the wheels on any of these tractors cannot turn 90 degrees either way, the ability of independent brakes to tighten the turning radius is limited. It helps, but not a whole lot. You certanly cannot turn on a wheel without being very hard on the tractor. I find that four wheel drive helps to pull the front end around about as much (on slippery surfaces).
As far as the 4010 goes, according to the specifications, it is not only a less powerfull, but also it is lighter, has less hydraulic capacity and three point hitch lifting capacity. I think I would still select it over the 2210 because of it's larger overall size. But I would have to consider the usage and my need for raw power.
Good Luck.