Undoubtedly i would opt for Abudhabhi as too many advantages we can find, some of them are,

1. Very good city, neat and clean and love to stay there.
2. Near to Dubai and many other cities within UAE.
3. Governancewise also it is far better than Bahrain.
4. Since Bahrain is very small place no better job opporutnities as well as less chance for moving around in holidays.
5. Abudhabhi is considered as better place in UAE to lead family life, better than Dubai due to less traffic conegestion.
6. In bahrain Crime is rate is more compared to Abudhabhi,

Looking above advantages i would prefer Abudhabhi without any second thought