I can give you my experience :
started Ryanair and after 3 years joined Netjets.
The crisis made bizjet jobs the worst place to be, but still the quality of life is higher.
I can tell you one thing, if i had not my B737NG rating and 2500 on type right now i would have been jobless in the bizworld instead i found many airlines jobs.
So i suggest go to airline THEN go to biz, so u can jump back and forth.
The other way around its hard due to rating.
D