Mara,
Depends on a few factors:
1) Age of child
2) Parent's views on what "education" means to them.
3) How long will you be in Singapore & which country you will be going back to in the future.
In my personal opinion, as far as preschoolers and kindergarteners are concerned - there are good local preschools which are cheaper than the "usual" international ones.
At elementary level, up to Primary 4 or 5, the local system gives the children a good grounding in Mathematics & instills some discipline in them. at Primary 6, the children have to take the PSLE, which is a kind of entrance/streaming exam to get into Secondary school. They would probably spend this whole year being grilled, doing exams etc to prepare them for the exam. The local system is still very much focussed on getting good grades in tests & exams, so if that is what you want for your kids (which many parents do), then it should suit you fine.
Drawbacks of the local system vs
International Schools:
- rather narrow curriculum; humanities & arts are pretty much ignored until the child reaches Secondary 1 where many children are suddenly overwhelmed when they realise that they have to study subjects like Geography, Literature, History & take exams!
- depending on which school you go to, the teaching of English leaves much to be desired - your child will probably pick up Singlish; not a problem if you are a English-speaking household & able to "correct" their mistakes at home.
If your intention is to make Singapore your home, then by all means, put your child in the local system. Very competitive but if your child is of above average intelligence, should be able to prepare him/her for the local Universities. Many local students do go to foreign universities (good ones) but I believe that they are more "conservative learners" (i.e. sit & listen & take notes, then mug for exams) compared to kids who have gone through the international systems where they are encouraged to be more vocal in class (i.e. listen, think & speak up/ask questions about the topic they are learning).