For this self-driving trip in Hawaii, we rented cars from both Hertz and Alamo for comparison. Hertz was over 100 RMB more expensive per day, but the service was average, especially since there was only one car available and we couldn't choose. Each time, it took an hour of conversation to exchange cars, which felt somewhat intentional due to the language barrier. The only advantage was the lower number of people and the high frequency of shuttle buses.