While I love both Montreal and Vancouver, I really believe North America at this time is in such a mess - one problem on top of another, and the US is so close as to greatly influence quality of life in Canada. I'm sure it's not paradise in Australia either (droughts and fires plus all the usual political and social problems). I would stay down in Australia if I were you - I know it always looks greener on the other side!
Just thank your lucky stars you're not in either Russia or the States!!!