I haven't worked for either, so stand open to correction, but I think they're pretty different jobs. Mountain is much more of a "lifer" company. Amflight tends to be more "up and out" mentality. Used to be that Mountain paid better, but that may no longer be the case with Amflight's pay bump. In any case, I'd expect to work harder at Amflight, but also fly quite a bit more and get typed in something resume-enhancing, vs. a Caravan. Depends on what you're looking for.