If you're well cashed up already Singapore will be nice to live in with a family, just don't plan on saving much. Even with the expat package from SQ you will need to add to the housing and education allowances from salary as they are insufficient.
Looking to save some money ? then ETIHAD give free housing and better education, medical insurance, staff travel etc. But inflation is worse, currency pegged to the US$, heat/humidity, crazy driving (just seen a news report of a MASSIVE pile up on the highway between Dubai and Abu Dhabi), usual Middle East living issues.
Basically better living in Singapore, better money saving in Abu Dhabi IF you can put up with all the rest.