TIME= (money / location )
Yeah well it seems like EK seems to be the best package amongst the 3 when it comes to getting the left seat on heavy metal, tax free money and a city that is 'cosmopolitan' keep in mind it all comes at a price.
EK as its a career airline so unless you intend to retire in EK time spent there won't count towards anything back home. Be ready to fly a lot , and I mean a lot not that we should complain caz thats our job but remember time is the equivalent of money , once that time is spent your not gonna get it back. It all depends on your personal circumstances and how much of a family person you are.
EK was a airline I did consider for myself a few year back but looking at the overall perspective of life I decided to stick with where I am current am and I'm not making as much pay but I'm still happy. I guess everybody rocks their boat differently, all the best !