housing allowance
Putting aside living in dubai, this is a personal thing that means something different for everyone for a variety of reasons, just concentrate on the housing.
If you're an SO or FO in HK at the moment with a family then you're starting to get priced out of the housing market, a single guy/girl can comfortably live in a 800-1000 sq foot place.
For me(single), the ability to be able to buy a place with the allowance in HK and have the captital growth go into my pocket is the only reason i'm here. You cannot even rent, let alone buy a similar apartment in dubai with the housing allowance they offer. so for me its not a good financial decision to go.
If I had a family here in HK there would be no way I would be able to buy a suitable place with the allowance now, hence I would be on the first camel train to the desert to live in one of those flash villas and have my kids' education paid for(tax free!).