Am tyring to go Vallejo Ca from East coast which is the best way to get there?

The choices are through Oakland airport which is the expensive of the two the other is through San fransisco am going to Napa valley in fairgrounds drive but I need to know which is a better commute and easy way, do they have transit buses or trains to catch.I know there is the taxi ride but it is about 40 miles either way to my address but that cab fare is alot