I have relatives in Canada, so I kinda have a vague idea what's life like there.
The healthcare is pretty good and is not expensive (unlike U.S.), and there are quite a lot of Chinese immigrants who speak Cantonese or Mandarin in Ontario, so maybe you can consider about moving to there.
However, if you main motivation is better education for your children, I would recommend moving to the United States. There are just too many Chinese students in the same colleges that usually the children communicate mainly with their race in Chinese.