Go for EK.
-Ek is probably far for being perfect..but still(compared to Q.R) condition there are much more better than in Q.R if you plan for a long term career..(profit share,pension plan,salary...).You should just compare what an EK pilot put in his pocket ater 10 years of service compared to a QR pilot..(i think without being wrong there is a factor 4 or 5 between both!).
For info after 10 years in QR...you will receive a end of service benefit of around.....70.000..U$
(50.000Euros..).(assuming 4....5 years as F/O and 5 years as CPT...)
Now just go an ask an EK pilot how much he will receive after 10 years of service with Ek...
.....and make the comparison.
-In QR you will be put on A-320
-In EK you will go to the A-330.(no A-320).
Both of them i think have tough roster on those fleet.
-Dubai has nothing to compare with Doha or vice versa.
-Cost of live for normal stuff (Food..) is more or less the same for both place,but of course the temptation of spending your money will be higher in Dubai..as there is more think to do.
-Entering a bar/pub or a club in Dubai is a little bit more hassle free compared to Doha!
-Gas is a little bit more expensive in Dubai but you have better public transportation compared to Doha,and buying a car in Dubai is cheaper than Doha.
-Don't known about EK, but for Q.R.: school allowances barely cover the cost for one kid.(and schools are very expensive here!)