Avoid MESS at all cost.

QOL is pretty simple. Can I get the days off I need? How many days off do I get? PDTs only serious flaw is it's schedules negative effect on QOL. I'd think about republic, Skywest, or maybe even PSA. They have better schedules and QOL.

If you can handle being away from home 19-20 days a month then I'd give PDT a shot.

Did you ever find out why Envoy said NO? Check ride failures? Skeletons in the closet? Lack of experience in the past year?