Don't think about the ALPA grievance. Not a factor in your decision.
If you live in PHL you can do a lot worse than AWAC. Living in domicile is huge and AWAC's biggest domicile is PHL.
Nothing wrong with RAH, but if you can get more than one offer I would seriously consider AWAC. Almost anyone will tell you that being in your preferred living situation makes the airline world a whole 'nuther ballgame.
Upgrades are about 3 years or so right now at AWAC. YMMV. I was 3.5. Last year it was 2.5.
Living in domicile is priceless. End of discussion.