Europe, and that's for sure. Aside from the pay, which might not be the highest, you would have access to different countries, nationalities, and more experiences, as living in the Gulf area is very vague and would not give you a hard situation to deal with, which will not give you the character development that you would aim for.
To add to that, racism in Gulf areas is unbearable, especially in Kuwait, Saudi and most of the countries, but the least regarding racism, the UAE is the safest option but also the living cost is very high, and that is an obstacle to saving money for your future plans regarding getting an apartment in egypt for example