Since both kids will presumably finish high school in SG, they don’t need to stick to the Australian system - is that what you are thinking?
I’m also assuming your company is footing the bill and they allow you to pick any International School
you wish; no budget considerations?
Within the International Schools
here you’ve got varying levels of academic rigor, although they are all comparatively “easy” compared to local schools! I believe UWCSEA is among the strongest academically, and I often hear that OFS is on the other end, being one of the least academically challenging schools.
Generally, international schools here are are academically “above average” compared to schools in their country of origin. This is definitely true at the Singapore American School where my son goes, but it’s not up to the level of UWCSEA (my opinion).
Generally not for profit schools are usually better, but not usually cheaper. For profit schools tend to have higher teacher turnover because they don’t offer the most attractive compensation (due to the profit motive). For school facilities, generally the bigger the school the better - and this can be a more important consideration at the high school level where things like access to equipment in a science lab can make more difference.
What about sports, is that important? Do you want your kids to have access to common sports played in Australia, or doesn’t it matter?
What about academics, are your kids high achievers? Would they be able to cope with a higher level of academic rigor?
What about university after high school, are they headed back to Australia?