Southern (& Atlas) won’t have a new contract for probably a minimum of 2 to 3 years - probably longer. And if forced into another amalgamation/arbitration contract...then it may be different than what we have now but it certainly won’t be anything close to industry standard. More like industry sub-basement. And by the time you find that out you will have missed out on many valuable years of seniority & money at a more enlightened airline.
In a nutshell —-> I’d say Spirit is the easy choice here.
Ps- Be very wary of what they tell you in interviews & job fairs. They’ve been telling people for years that a great new contract is right around the corner. Watch what they do (sue & stonewall the pilots, violate the framework agreement as well as the current CBA) and not what they say (picture used car salesman trying to get you to sign up for in-house financing).