Okay, maybe the OP didn't use the best choice of words about the Clampett factor. Putting that aside...

I fly out of SFO all the time. The lines at AA are always short -- I'm usually through security in a few minutes, maybe I waited 5+ minutes once or twice. All the gates are very close, and there's a small Admiral's Club. Food on AA side is not so interesting, but post-security you can easily walk to the food on the UA side of the terminal.

I've only flown out of Oakland once recently, on WN. I was doing a last minute trip to LA, and AA wanted $900 while WN wanted $99. At 9:45am I booked a ticket, left the Mission, and made a 12pm WN flight. But, that's only because I had no checked luggage, and I ran to the front of the security line and begged to go so first I could catch my flight. The WN staff at the front said "well, you'll have to ask these people who have been waiting" and the people at the front very kindly let me cut the line. Otherwise, I estimate the line was about 25-30 minutes.

Length of line: Have to give it to AA at SFO

Time to airport: Depends where you're coming from. From the Mission, SFO is faster by both BART and car.

No idea about rental car drop off at Oakland. At SFO, it can add a bit.