I'd say the very first priority is people who are able to reproduce, and would make strong children. Strong in the sense of "having the most chances of surviving a hostile environment". But that's just in the worst of catastrophic scenarios where the bare human race survival is at stake.

Then we have to look at people able to provide what is absolutely needed to keep these breeders and their children alive : agricultors, hunters, fishers, builders. And we move up the needs ladder until we have a working society.