One thing I have learned through my career (I am no longer an airline pilot) - work for a company with a strong, respected management, and a positive workforce. I think CAL is a great airline with a bright future and a history of strong management (since the mid 1990s with Gordon- and yes I know the past history with Lorenzo), but low morale and constant labor battles in the future will likely take a toll. Key takeaway - go to SWA and work with the most positive culture that any Fortune 500 company has to offer.
Good Luck