I chose PDT because they are growing and the junior Jet Captain was hired in July 2016. That is not a projection; and that is before the acceleration of jet deliveries. As far as the flow - it is a projection either way, but I would rather climb through 500 pilots than 1,850 pilots. And at PDT lots of senior guys will chose not to flow. Couple that with little reserve time you can build lots of PIC faster at PDT which will increase your odds at a job with the majors. I would not count on the flow as the only way to get to a major.

Pick a company and move to a base. I would not recommend commuting, especially at the regional level and the regional airlines schedules. Any of the WO is a good choice in today's environment; you have the stability of being owned by AA, decent pay, good travel and healthcare, and a flow. And hopefully bringing back flying to the WO's will be faster movement at all companies.