Renting a car in the US is the most convenient.

A very enjoyable car rental self-drive tour

Great service and very attentive. Quick pick-up and return. Highly cost-effective. Highly recommend!

Overall it's quite good, with a competitive price. They didn't push any extra items when picking up the car. Since I was planning a road trip, I opted for roadside assistance at $5 per day, which is reasonable. Alamo is quite friendly about opting out of certain charges, like crossing the Golden Gate Bridge (north to south); if you pay online yourself, you can automatically opt-out of Alamo’s charges without contacting them. Picking up a car at San Francisco airport was quite intense, it felt like there were more people than cars, and you had to grab one as soon as it appeared.