How old are you? You say that at SWA you will only make top 64-69% in seniority. I have been here for 2 years and am already at 79% system senioity. SWA still has a ton of jets on order and who knows about possible future orders. Upgrade is still 5-6 years and at that point you can expect to make $180,000+ a year until you top out just over $200,000. And that is by just flying your line and averaging 17-18 days off. I made $102,000 year two without picking up extra flying since im a commuter. Figure another $10-$15 grand a year (for years 3-5) unitil upgrade.
If it were me, I would pick the best job that gave me the best quality of life rather than how big my jet was or what the overnight city was. Living in base is HUGE for the quality of life decision. Do you have kids? Why does your wife like Dallas so much. I am willing to bet that she has family there and it might be nice for her to have kids around family (grandparents ect...) especially when you are out of town. I was kind of surprised by your comment that Dallas is were SHE wants to live but not you??? If you love your wife let her be a part in the decision on where she is going to have to spend the next 20+ years while YOU are gone...unles you are already planning on finding a new wife.
I was a United furloughee and live in the northwest. I always wanted to be based in Seatle for ease of commuting. I recently resigned my United recall and will stay at SWA because it is the sure thing. With mergers, long upgrades, low pay, and highly leveraged finincials, I couldn't see going back to United. Even if United's pay once again goes above SWA's pay, the higher earnings I make at SWA now with quicker upgrade factored in will most likley exceed those that I could ever make at United when compounding interest if taken in account.
What ever your decision is, good luck. IMHO, chosing Delta will lock you into a commute from Texas for the rest of your career and lower earnings for at lest the next 10 years....chose wisely!