A bit about our situation and what I think:
I am a "westerner", educated in the USA in a small public school. I was writing 20-page research papers with full peer-reviewed reference sources when I was 17-years-old and reading and analyzing difficult classical literature. My teachers were tough! I studied both AP (advanced placement) Biology and Chemistry courses which included real-life science (like monitoring a nearby river and running water tests etc.) I also was taking black/white photography from a well-known and published professional photographer as an independent study and I learned how to do electric wiring and historical archiving--some of the work I did is in a collection in the Library of Congress (along with my classmates). I had a very eclectic education that was free. I went to a state university (even though I was accepted to others) and also felt I got a top-rate education even though my school was small and not famous. To me, education is and always has been about 1) the heart and ability of the teacher 2) the effort and interest of the student 3) learning how to learn--developing the skills and attributes (like curiosity for one--which is not really encouraged in many local HK classrooms, unfortunately).
But, my life in the USA taught me more things outside of the classroom that many children probably won't get exposure to here in HK. We lived near to nature and were able to explore more. My dad had a large organic garden which I helped tend with him--that was a great education! There was simply more room. So, education, to me isn't all about what happens inside the classroom walls.
Are you thinking of sending your child to boarding school? I know that in some places you can send your child when they are in primary school. I would never, ever send my child to boarding school because I don't want to be separated from my children--I think it is my responsibility, honor and duty to be a daily influence in their lives--even when they are teenagers. I don't think the possible rewards of that situation outweigh that component--for me, that is.
I studied Mandarin Chinese in university and lived in China in a fully language immersion environment (ZERO English) for a year. I understand Mandarin quite well and speak semi-fluently. I can even write some Chinese as all of my exams were conducted in Chinese. Some of my dearest and closest friends are Mainland Chinese. I've traveled all over the country on the train (that's how you really get to know who Mainlanders are, I think). I've lived in a couple cities--one in the far-far north and one in the far-far south. I've had my share of experiences with Mainland Chinese people. Some days I hated it and some days I loved it. Overall, I'm still enchanted by Mainlanders, although I find many of their particular habits annoying and even disturbing (like the one time I was standing on a crowded Mainland bus and I had to stand for about an hour and a man sneezed all over my face and arm--lots of snot came out--made no effort to cover his face--and I had nothing to wipe off with so I just kind of had to stand there--that was pretty disgusting).
My husband is Hong Kong Chinese--grew up here all of his life--was locally educated and then went to Australia and studied for 4 years in university. He used to work in a factory as a manager in Shenzhen up until a year ago. I used to work there as well and I used to stay in a Mainland Chinese dormitory on the factory premises.
We have two children. Our eldest child is in K2 and is attending an SKH local kindergarten nearby where we live. I am satisfied with his kindergarten and he loves it. My son is very clever (if I do say so myself!) and for us only a portion of his education actually takes place at school. He learns a lot through doing different activities--especially with my husband. The most important thing right now is that he loves learning and he's curious--as long as he can maintain these throughout school, he'll do fantastic.
The problem is--and I know this as a primary school teacher in Hong Kong. Often what happens in HK primary school classrooms is the opposite of inspiring students to learn. What happens is students get burdened with a heavy load of work which kills the joy of learning for them. At the same time they are being taught to memorize correct answers and not really think for themselves. This is a widespread issue in HK, I think. I cannot speak about the international schools here because I don't know very much about them.
So, what we have done is choose a school that has a unique environment. The school where my son studies is much different than many larger schools in HK. The children spend more time outdoors. They keep a garden there. The school has a lot of good programs for the children including great English and Mandarin lessons. And I like the teachers. There are other "mixed" and foreign students who attend as well.
I think that no matter what you choose you have to select the school based on your "gut feeling" and not only because of a reputation or because you think your child will learn this or that there. Choose the school that fits your child. Don't force your child to fit to the school. Every school has a unique environment, culture and feel--you have to choose the one that lines up with what is important to you and your child.
But, no, we won't be moving back to the States just so my children can go to school there. We might, however, choose another country--thinking about South America.