Neither?

If I were picking an airline right now, I'd be looking at Endeavor, Piedmont, or CommutAir. Go to whichever one has the easiest commutable base. If your in the DFW area there will be plenty of flights to get to and from work.

Mesa has the worst pay in the industry and their quick upgrade ship has already sailed, and Envoy is ultimately going to shrink and you will be on reserve for quite some time. If you want to go to an AAG wholly owned right now, go to Piedmont. I know 2 guys at Mesa, one a winter 2014 hire and the other a spring 2015 hire, both are trying to leave.