NZ has awesome scenery, really beautiful country and friendly people, and great if you love rugby...but other than that its not a place where you want to live. Everything feels small town, and most kids either want to become rugby stars or failing that, move to australia.
Australia is a far better country if you want to spend more than a holiday there. Cities are big, sports are all well catered for, good gyms everywhere. Weather tends to be warmer...the only thing is the fucking bugs...millions of em everywhere!!