I would say Hong Kong (I am in Cathay). Has great nightlife, good social networks and it is NOT all people and neon signs. Most of HK is parks and mountains and if you live on South Lantau for example its beautiful and quiet!
If you join CX mainline you will not be an FO, have you considered that? You would have to join as an SO and wait for the upgrade (2 - 3 years) and you would not get an upgrade on the 744 either. it would be Airbus or 777.
Money is great (CX FO earns a lot more than an EK Skipper), rosters on the ultra long haul fleets are great (4 day pattern followed by 5 days off quite often 6 or 7), Cathay has massive expansion plans and the Union/Management are back in talks - Things look good for CX now but that as you know can change overnight!
Best of luck!