I'm confused as to how SJC could be considered a much better airport than SFO. Many cheap flights do go to OAK but Virgin and JetBlue also fly out of SFO. I've

I'm confused as to how SJC could be considered a much better airport than SFO. Many cheap flights do go to OAK but Virgin and JetBlue also fly out of SFO. I've never had a problem finding a cheap flight that goes out of SFO, if I have time to plan ahead.