Originally Posted by
AutoLook
You also need to take into account, that a rental car company, which operates worldwide, provides a different service depending on the country you are in. In one country they will suck less than in another.

Except that SFO and SNA are not just both in the same country, but both in the same state.
I've rented from Advantage in SNA and had a good experience, SAN and had a horrible experience. I think SNA is usually better in general.