Chuck is right,
For the guy with a hunting lease and a place in the city, the big ATV would be the way to go.
They have implements for all three, but only a tractor is made for working. A ATV is made to run at a certain speed and discs and harrows will operate at slower speeds. You may have to stop and let it cool before you can finish the task. I don't know how much you are planning on doing.

My advise is keep an eye out for a used gas burning tractor. Diesel tractors will cost more and a good one will not be on the used market. But a used Gas burning Utility tractor comes up for sale all the time. They will work well for what you are needing and wont cost more than a Utility ATV. Some where between 5k and 10k.
If you go new stay away from the Big three unless you want to pay top price. about 10-20k more usually. They usually sell to the Full Time Farmers who could really use the extra performance.
For this a good Kubota is plenty of tractor. A dealer near me is selling older model low hours (like under 100 hours) 30-50 hp tractors for about $1500 to $2400. Of course you get 3 implements thrown in plus a FEL as well as the trailer they are loaded on in the deal as well.
It works out to a good deal and you don't have to go hunting around for attachments and crap just to get a basic kit together.