It depends on your plans and goals. If you simply want transportation to your resort and don't need a car while you're there AND money isn't a motivating factor, I would use a towncar service. They help you with your bags and get you to your destination quickly and comfortably. They'll also do a grocery store stop for you.
If saving money is important, Mears is definitely cheaper for one person. But, you get what you pay for here.
Finally, if you want to have wheels while you're at the resort, renting a car is not a bad thing. With plenty of advance planning, you can probably find a reasonable rate. Sometimes economy cars are pretty cheap.
Food for thought.