Second what mrivc211 said and will also add that a lot of airlines would definitely prefer jet time and glass time on the resume. It may not be a necessity now but the competition two or three years from now (the earliest you might be able to apply to SWA) will have that experience on their resume. Also consider where you will be happier long term. You have to consider that you might not get hired as soon as you reach 1000 turbine PIC (which is probably the case realistically). If it were me, I'd rather be at ExpressJet flying a jet around the US, Canada, and Mexico than a turbo prop making short runs around the southwest but that's a personal preference and different for everyone. I feel that experience will open up more options down the road. It's difficult to be picky in this career. Also, how old are you? Slow down, enjoy what you are doing at the momment and don't be in such a hurry to get to the next step...it'll come when it comes. Trust me you'll be a lot happier if you approach this career that way. Above all else, good luck with both interviews. The good news is that either option is a potentially good one. I think XJT will impress you while you're in Houston. PM me if you have any questions and I'll atleast share my experiences as a XJT FO so far.