There is a priority something..............
The priority part is actually just to check your ID and boarding pass; once you get through that then you join everybody else in the actual security line.
I find that SJC is much more efficient than SFO
No lounge at SJC.
If you like espresso coffee and get there early, walk towards the new part of the airport and enjoy a coffee at Espressamente; it is an Illy branded store and they make a great cup of espresso.