You need balance.

I do not know condition in 澳大利. I think Canada is good for the development of children as child can apply US school, and  work in US. So childen will have more opportunity in Canad than in 澳大利. But for adult, it is very diffiult to say, and many of us try to find job in US, which you need to beconme citizen of Canada. As a Canadian, welcome to Canada.