We have done both. We prefer a rental car but don't use it all the time. We like the convenience of using the car to go to other resorts and off site for store stops, etc.
Unfortunately, the rental car prices are outrageous this year (around $150-$200 more for same car, same amount of time, same time of year, than last year), so we are opting for town car transportation for this trip. I feel the rental car companies are gouging and I won't rent right now.