Balancing act
You need to look at the pros and cons of both CX and EK and work out what is important to you. You will get more money(after tax remember) etc in DXB but you can't get basings. You are closer to EUR but further away from Aus.
On money and time to command EK wins. On clean air EK wins. On flexibility of basings(so far!) CX wins.
I have a friend who has worked for both airlines. He said management is similar but training is superior in DXB - ie, they actually pass you if you pass your 4bar - no star chamber stuff.
We have pollution and a decade longer to command. They have more traffic accidents. Their education/housing allowance isn't taxed, ours is.
Depends what is important to you I guess!