Kash:
You go for EK, treated better, better buildings, better pay, (better allowences, flight pay and basic), and everything is very organized(at least when you get down there

)
EY is a great airline, but it really depends on if u wanna live i AUH or DBX, wana work for the impressive EK group or want to be with a small newly started airline, which is definetily exciting as well!
EY will be such much better, but it will take a couple of years before trainingfacilities and buildings are all the same standard.
I had the same choice as you have now, EY or EK and I chose EK.
Have some friends that are doing training w EY now, and they are all....You take EK!!!!

But they love AUH.
I personally love Dubai, been flying down there with my airline all the time, know many in EK, and I am confident w my decision. Although EY has a fantastic product and the crew is really great at service
Good luck with whatever you choose!!!!