Do NOT consider NZ! If you have a choice, AUS universities are at least 5 times better than any NZ university. Think: no standards, no English skills (they are considering allowing text messaging language in exams, for crying out loud!), no motivation, no competition, and general laziness. Salaries are miserable. You will get almost no superanuation, compared to AUS, and will not be able to save anything from your meagre salary for retirement. Ambition is frowned upon, if that is what you mean by the 'kiwi way of life'. If you want a poor and lazy lifestyle, NZ is the way to go, but if you want an actual career, go to AUS. Once you are in NZ, you are stuck - your salary will not buy you many flights out of here, and all flights, even within the country, are expensive! Housing is outrageous and generally unliveable. The health care system, and private health insurance are useless - go to Australia!
For what it's worth, from someone who spent five years in NZ and recently moved to Aus, I find the above largely accurate.
At least, you didn't get stuck there in NZ.
Regarding the superannuation, if I understand this correctly, you get 50% of your last salary, given that you have been working for 15 or 20 years in the NZ University system. Beside that you can of course invest in mutual funds, in your home and so on. That seems OK for me.
If once you are settled in NZ, this system should work. It is difficult, however, if you move back to US or even Europe, because your savings do not have the same equivalent value in these regions.