At u-haul, the difference in price between the dolly and the full trailer is less than 20 bucks. Given that, and given that the full trailer has brakes while the dolly does not, and also the full trailer has your car completely off the ground and more protected from stuff flying off the underside of the truck (rocks, pieces of the pile of junk they call a truck, etc) I’d go with the full trailer myself. The dolly will work, but the trailer is better.