I suppose that's why half of Kiwiland lives in Aus.
Just going from my experience, live and travelled in oz for a year, now emigrated to nz and really do prefer it, depends what you are after i suppose.
if you want unbearable mars like temps, killer spiders , sharks,crocodiles, pissed up brits in every bar you go to, Oz is the place.
If you want to bring your kids up in a more laid back, friendlier, safer, still good weather but not stupidly hot place, nz is for you.
No freebies here though, andsky sport nz is toilet