There is one reason you should choose MESA. If everywhere else says NO, then go to MESA.
Other airlines offer fast upgrades, high pay, better QOL, better medical benefits, better standards, and the list goes on. There is not one good reason to go to MESA. A two leg commute to any other company is better than going to MESA. Sorry. But it is. It's not that there is anything grossly bad about MESA it's just that there are so many better options right now. PDT, SkyWest, Envoy, Endeavor, PSA, Republic, and other airlines are much better options.