A quick survey on parking lots and shuttles.

I'm flying into/out of SFO frequently now. (Elderly parent in the area.) I've been using Park 'n Fly; no particular reason. Lately, the time from arriving at the lot to arriving at Terminal 3 can be an hour or more, even at "peak" times. Return shuttles can be 20+ minutes apart. I stand and watch three "green" shuttles (ParkSFO) come and go, before the "blue" Park 'n Fly shows up. So, is the grass really "greener" at ParkSFO? Somewhere else? Thanks.

I don't care (much) about cost or (at all) about earning free parking.