What you get extra with Avis and Hertz, versus Enterprise at San Francisco Airport

So, yesterday night I arrive into San Francisco Airport on a much-delayed flight from Chicago. It is after 1.30am when I get to the car rental center. I had a reservation with Enterprise. But the Enterprise desk closed at midnight, and their kiosk closed at 1.30am. So, I rebooked with Avis. Avis and Hertz both had staffed desks.

I was shocked to see that Enterprise didn't have a 24-hour operation in an airport like SFO. Next time I'll just choose Avis. I had been experimenting with Enterprise, and appreciated their friendly service, but in this case I felt let down a bit...