Having done both (and still operating in UAE).....Oman takes the cake!
It is a magnificant Country, great people and the money is better as the accomodation is half the price of here in Abu Dhabi, even after the recent Oman rent rise!
If I was married I would never have left the place, bit sleepy in the social scene. As it turns out I am still not married but having a lot more fun trying!!
Horses for course though, the only way to really find out is visit and make your own mind up.
Good Luck
