As you know Red Dragon, thats before school fees. As I have said in previous threads, if you have more than one school age child, you are better off on an all in package like Bahrain where you are getting about 22,000 dh's including school fees and living in a villa (but you live in Bahrain). Whereas if you are without school age kids you are better off here, and if you have one young school age kid, it is about the same.
Cost of living comparison between Abu Dhabi and Dubai though is an easy one. You will end up spending a lot less day to day in Abu Dhabi than Dubai.