Because NAIS is new and no published data in university placement.
For ESF, it depends on ur definition on “hea”. In kindergarten, ESF is play base learning and yes sometimes not as structural as other schools. From primary one, I have no experience yet but should be more structural
We moved from ESF to NAIS. Apart from a number of reasons that Donng0411 has mentioned, the key difference between the two school is the curriculum they follow. You may want to consider what curriculum suits your kid more at this stage.
P.S. we have got a few competitive offers for year 1, but decided to stay with NAIS because we are very happy with the quality of teaching.