International vs. Local Kindergartens

My husband and I are returnees from the US. We grew up in the HK local system (band 1 local schools in hk) and spent more than half of our lives in the US. We speak fluent English between ourselves and with our kids. Our girl is turning 3 next year and we are contemplating whether to have her do the local system or the international system. We are christians and we hope that she can go to a christian school.

How easy is it to switch