You have a tough decision because I understand the issues with charter flying. If you come as a DEC I have no doubt you will be happy for a period of time. Then, if you are like most pilots here, things begin to wear you down over time.
You will NOT be looked after by the company. Sometimes yes, when it comes to things like an illness or a family death. (although even that one has become tenuous at best) But overall the company does not give a rats ass about pilots here.
You allude to the fact that you are better off financially now. Did i read that correctly? If you are better off financially then think twice about coming here. As far as coming as a DEC, you will be treated the same as if you joined as an F/O and did your time. Pilots here are pretty good about that, in other words not blaming you personally for a flawed and idiotic policy.
Here is my guess for your future if you come to EK. You will come here, find the immense growth of both the city and airline to be fascinating. You will enjoy the flying too because the route structure and aircraft are great. Everything else, such as bidding or FTL's will be a negative. After 4 to 6 years you will be seriously considering some other expat job because the growth of both airline and city becomes an irritant to you as it affects your daily life in a negative manner.
If you are married, your biggest issue will be if the family likes it here. Their happiness or lack thereof will have a bigger effect on you, than all the other crap or good things about this job and this place.
My best advice is this. If you are happy where you are........ stay there. If you are not happy where you are, then the veneer of Dubai will last longer for you and subsequently will result in you staying a few more years in Dubai, thereby making your move a better choice.
Best of luck.