It's all very relative. Hypothetically, under exactly the same package, the guy in DXB is probably happier than the guy in RUH and the examples go on.
From my experience and info from mates there, and as long as, and if applicable, the kids' school and accommodation are taken care reasonably well by the employer, one's money should offer a better life-style in DXB than in AUH or DOH, BAH better than AUH or DOH but worse than DXB. And again, all depends on one's preferences and backgrounds. Some families love it in MCT because the schools besides the lovely scenery outside the city but there are other things they deslike.
For jobless, low paid (previously) folks, and wannabe skippers, most of the established Gulf companies are a good deal. Better for the single or married with NO kids. When the latter start arriving and they are in school age, well things aren't pretty. Therefore, it's a mix & match.
I'm sure there are better employers than others. A lot has to do with the company's own HR and accounts. The guys who you need to deal with when things don't work. Most Flt Ops staff is supportive up to their limits (jurisdiction). Sometimes the flow-chart is not so flowy...
Keep flying safely!