Etihad also an alternative in the region. Package is similar to EK but no provident fund. Smaller airline but some prefer to live in Abu Dhabi as dubai is getting busier and busier every year (quieter and more family orientated, plus only an hour from dxb by car).
Money wise I would say EK is better.
in the end they are all the same fundamentally…its probably better to consider where you want to live…Dubai - nightlife and glitz
AD - more cultural and quiet
Qatar - not much to do compared to others