SIS vs CIS

My initial impressions of the 2 schools are as follow, what do you think and which one will you choose

SIS:
Strong in Maths, Science and discipline
CIS:
Strong in university network

Both are bilingual. So, I’m thinking it’s good to have a foundation if started with SIS and changed to CIS for secondary school. But the drawback is the kid has to adapt to new environment and uncertainty of whether she can be admitted if change school.

Anything can be shared?

Thx!