My business plows with both. A truck and a 71HP tractor. I plow private lanes, farm driveways, etc. no parking lots. Got out of the commercial racket in the 90's. Since you already have a truck (and if you don't really require a tractor) I would put a plow on your truck in a heartbeat. 1/2 ton 4x4 trucks are great for personal plowing like in your situation, or even a small plowing route if you equip them properly.
One of the old hats that competes with me but has been plowing driveways since the 60's uses 1/2 ton Chevy trucks almost exclusively. He says they're cheaper to buy and if you add a few accessories, they are lower & easier to work out of. He puts heavier springs and shocks on front. I think a lot of the truck manufacturers try to "scare" you into buying more truck than you need-particularly for plowing. Some of his trucks have over 200K on them and still plowing.
I started my plowing business with a Jeep CJ-7 back in the mid 80's and thought it was one of the best plow trucks I ever had. VERY manueverable and even with only a 7' plow, it could do most small driveways in 10 minutes.