The BVI does not allow foreign franchises, which is why you don't see Starbucks or McDonald's. So places like Avis, Hertz, etc. are local businesses using the reservation systems of those companies, in the same way Scrub uses the Marriott reservation system but isn't run by Marriott.

We have used National for years. The ladies recognize Ratman's voice when he calls, and they treat us very well. Their cars are well maintained. A bonus is being able to park at Maria's when in town!