International schools in JB might offer education comparable to the better schools in Singapore. I have yet to see their curriculum and education philosophy. However I believe the advantage is they provide more enriching lessons not set in Singapore's context, which helps the child to develop in a less stressful environment.
The other aspect of education is outside school, which many parents in Singapore missed out. They simply outsource to enrichment classes that unfortunately, mostly drill the child in scoring A and nothing else. In Singapore, everywhere is crowded and expensive. JB offers the space and lower cost opportunities to do things as a family together.
Most importantly, getting a good degree nowadays doesn't guarantee success, especially in Singapore's context, because the resources and opportunities are tightly controlled by government and a small group of wealthy people.
With a larger cohort going to be given the chance to get a degree, the value of the degree will drop (
http://www.moe.gov.sg/media/press/2...rtunities-in-singapores-university-sector.php). It is simply a matter of supply and demand. It is good to give the child something special that lets him/her stand out from the rest.