I have not been to australia, but some of the worlds best surfers come from there. Given the choice of Australia ad Canada, I’d take Australia from a purely emotional frame of mind, basing it on what little research I have done. History channel, movies, pop media stuff, travel magazines, etc. No real, quantitative analysis, though.
I did seriously look into moving there in my younger days, though. Canada was never on the radar scope then, and never will be.