Completely agree Enigmajet. If you join a company with a union you are likely to have more control and negotiating leverage - that's intuitive. If you join EK or another airline in the Gulf (any airline that is government owned), don't expect much negotiating leverage. Don't expect the local government to necessarily abide by their agreements - don't be that naive. EK will do what EK wants to do. So, if you go to EK, don't expect any negotiating leverage - you are basically along for the ride (good or bad).
So, go to EK with your eyes wide open. If you can't handle that lack of control, then don't go to EK.