Sig,
The most important question you have to answer yourself is where do you want to be in 5-8 years time? Will you miss a great or good long term opportunity to fly in the Middle East? Then what?
After a few years will you have the same opinion about being here, will you regret your move or will you be happy for ever after?
Few things to ponder choosing between civil world vs third world (Dubai is a modern cosmopolitan city with lots of malls (where you are not allowed to hold hands in public) that can offer a good outdoor lifestyle). Maybe read the Gulf News online and self educate yourself if you could be comfortable with the local way, as said previously, you really have to educate yourself on the airline, the city and the country.
If you can close your eyes on the DXB and EK dark sides on the long term you will be happy here, if it gets under your skin you will be so miserable.
Now let's say you take the EK job and enjoy a few good years. You get fed up after a few years, what will be your options out of here? Will you do the sacrifice again of starting at the bottom of a seniority list back home, go corporate, be a contract pilot?
Certainly the first few years will be enjoyable, discovering something new. When the discovery is over what's next? Shall I stay or shall I go?
Good luck!