Wheels, sometimes I do wish it had tracks but not often. It's a blast, there's so many cool implements you can buy or rent you can do damn near anything with it. It's a John Deere, btw, can't remember the model number but it's one of the bigger ones.
Get as big a tractor as you feel comfortable buying. You'll need it. I have 16 acres and have been putting off buying a tractor. Could use it though.
My neighbor farms about 120 acres. He's got all kind of equipment. His skid steer is awesome. It's on tracks. He's got an 8 foot snow blower attachment. He clears my 130yard driveway in about ten minutes.
You'd use them differently in that scenario, send in the goats early to dehydrate and exhaust the men of the area in order for the ground troops to face less resistance as they move in.
I have a guy that comes out to brush hog and maintain my trails. He uses a Woods BB hog and a very large Mahindra Tractor. His price is so reasonable for the work involved. Maldonado found a guy that will deepen and enlarge my pond for free if he gets to keep the dirt and haul it off.