Gulf Air, Emirates, Etihad, or Qatar?
It all depends on your immediate needs. DO not dream coming here thinking this is the el dorado. That's gone long ago.
To enjoy working and living here,
you need to need the job first because you don't have one or some other very pressing issues.
You may find here a different technology (glass cockpit versus old Boeings, Convairs, etc.), cabin crew serving you
, flying in no-war areas or training and management structure you never had in your life.
First things first. Secure free or less costly company housing and try to have the company pay most of your kids' school if you have them. It's very poor now versus ever rising fees. If you don't have kids
or you are single, the better.
Life in the cockpit is generally pretty good. Watch factoring and the night flying. There will be loads of it.
Oman is really good for time off.