Quality of life in my case, and I do want to work for SWA. One can argue that they "don't require the type," but the information I have from very reliable inside sources still points to favoring the type.
Adding a type to a pilot certificate is never a bad thing. It builds or maintains a skill set, is a new opportunity to improve one's self, it's a networking doorway, etc.
This thread could go for days on the merits of the type...and both sides will have good points.
Now I have "B737" on my certificate, and that's a plus for ME.
(Also, I now have 24 hours in the very sim they use for UAL interviews. UAL is my second choice.)