CDNIS vs HKIS

My kid is in pre rec at CDNIS. While he loves his school and I don't have much to complain about, he's lucky to receive an offer from HKIS.

Now I am really torn. On one hand I like CDNIS as the teachers and the community have been wonderful. Parents in his class are so friendly and supportive. The teachers are great and my kid adores them. Yet HKIS seems to be an obvious choice for many due to its scale and track record.

Would love to hear your views for them.