San Francisco Alternatives

I did a quick trip into San Francisco airport late last week. The trip into the car rental area has improved slightly, but it still takes an incredible amount of time to get your car and leave the area. But, in recent years, the alternative airports have decided to move the car rental facilities off-site as well. So, should I take a bus from SJC or OAK, or catch the train from SFO? The alternatives really aren't much better than the main airport, so I guess it's just up to the airfare and distance to your destination that would make all the difference. I'm headed back up to the area a couple of times within the next month, so maybe I'll try something different next time. Later.