Have you really visited the campus and walked around their playground? It is not small at all (bear in mind the total no. of kids in the school is actually not high). I have visited some other kindergartens and their playgrounds are smaller, even though they have much more kids. (Some even don't have any outdoor play area.)
My girl is now studying K3 in HKPS(Kln Tong). The outdoor playground gives them a lot of space for fun. Apart from the nice campus (which is actually not the most important factor), the language training and the teaching method are excellent. I am very glad that I have made the right choice!