Emirates. But only if you really like to live there and you accept the facts of an expats life. You might be able to come back, but I would not count on it.
I am with Cathay, never flown with Emirates, so it might be a " grass is greener" thing, but things ain't what they once were over here..
For me(!) the biggest problems at CX are the long time to command ( 15-30 years) and the high failure rates at command courses.