It's easy! You want to upgrade faster and go from FO to a Major faster then it's a no brainer. PSA would be your choice.
If you want good pay, good health insurance and wait 4 years to upgrade then it's AWAC.
If you want to go to an airline that has a awful contract, with crappy health insurance, 7 year upgrade....... Then Pick Republic.
See it's simple. Now I just can't figure out how anyone would go to Republic.
See how I added Republic in there just as I did Piedmont. hahahahahah