DEC or F/O
As someone said a good working environment is most important.
As for the airline we don't speak of, little is known and must of its policies are hush hush which makes you wonder would you really want to work in such an environment
EK seems to be careless they are a well oiled machine and will keep going at it to fulfill their needs with little regard towards any work -life balance.
QR seems like the only workable environment
This is my two pence..just a perspective
All the best