You'll have to provide your own answers, but if I were just starting out and knowing what I know now, here's a few considerations:

1) How do the near term retirements and mainline growth plans compare?

2) How do the contacts compare (the other 800 pages besides pay rates)? It turns out that all the small print actually matters.

3) Non-payroll benefits? Everybody always looks at the pay rates but how about retirement contributions, medical benefits, disability, and profit sharing?

4) Corporate culture. It's not just how the company treats its employees but each pilot group has its own idiosyncrasies and attitudes. Which one is a better fit for you?