Delta has variation of flying.
Different equipment and long haul int'l.
Not sure if SWA will ever convince themselves to move up to bigger airframes.
The above also affects pay.
At SWA, we work hard for our well earned pay. Think America's largest commuter airline.
My top priority ever in this business was job security. Up to now, nobody beats SWA on that.
Good luck with such a fortuitous decision!