Hownow, a couple of guys on Jetconnect yes's and also Pac Blue.
I think everyone would agree that the dash 8 job is the better one, but as has been mentioned here, if the goal is Airnz, then the 1900 would have to be the best option for getting an interview quickest. Commands at Eagle coming up in less than a year, where Air Nelson is around 5 years. Except for a few lucky fo's in the past few years, you need a command to get an Airnz interview.
But as Bongo said, both are pretty good options, and there is so much movement coming up at Airnz that it probably really doesn't matter where you go.