Full disclaimer: I don't work for either company.
I would take the class date at UAL and move to a real city that has a better young professional scene. Orlando sucks for a single man your age (been there, done that, and it was kinda lame).
Secondly, don't wait around for a potential merger announcement. Even if it does happen, there's a solid chance that B6 managment completely flubs it up just like they did with NK.
You don't want to waste years of seniority movement elsewhere while some coward like Robin Hayes fakes a health condition to avoid being accountable for why he's so bad at running an airline.