PSA is currently a better choice. PSA will give you a better quality of life and pay. You’ll definitely have a better schedule, credit more (make more money doing less work). I can’t speak to how long it will take you to hold CLT (ask that on the PSA page), but the wait will be better than coming to PDT. Don’t even consider flow. Flow is honestly about the same for a new hire today at this point between all 3 WOs.
The only reason to come to PDT right now is if you live at PHL and don’t want any reserve and you want to work 4 days on and 2 days off over and over again every month forever. Yes, you’ll be able to get CLT eventually, but your schedule will still be terrible 4 days on 2 days off with inefficient trips and min credit.
Go to PSA. You’ll make more $, work less, and you’ll have CLT.