Flow is huge. It's a great insurance policy. And it systematically removes people above you on the list so your seniority gets better, not including normal attrition.

Since all carriers are fly only jets as of yesterday with PDT getting rid of their Dashes, don't get distracted about what jet you fly. It really doesn't matter.

Seniority is everything, so between PSA and PDT, go to whichever you think you'll gain the most relative seniority the fastest.