I use ScootAround or One Stop Mobility. They are reasonably priced and have well maintained equipment.
I had issues with Apple Scooter; would never use them again. We rented two Victory 10's, but received Endeavors. Mom's died mid morning the first day and my 8 yr old daughter had to push her out of the park. It was more than an hour before someone could bring her a replacement. At least they brought the Victory. Mine died the next evening, but instead of going through the hassle of calling and waiting again, we just pushed and towed back to the hotel and had shortened days.
A Scooter 4 U was ok if not spending a FULL day in the parks. It didn't hold a charge well and the scooter had been more than well "loved" in its day. For instance, the arms were taped together with electrical tape.