I'm at Atlas pilot. We know how contracts stack-up today. We don't know how they'll stack up tomorrow. Kalitta is where it's at.
That said, everything we hear about Atlas today is what we heard about K4 a few years ago. At that time people were leaving K4 to come to Atlas. I think it's pretty likely that we'll be compensated more than Kalitta in the future. Kalitta and Atlas will both pay less than FedEx or UPS for the foreseeable future, so neither place will be a career destination. This is really unfortunate because I like what I do and the people I work with.
If you're thinking you'll be in and out in less than five years, I'd go for the best quality of life and fastest pathway to the left seat. I'd be financially and psychologically prepared for that five-year plan to mushroom out to ten+ years if there's a recession, major industry shake-up, etc.