It is always great to beat the Aussies in anything. The humble New Zealand passport is the latest win in our favour. The New Zealand passport will get you into 168 countries without a visa, the Aussie passport, only 167.
The best passport to travel on is a British or Swedish one, as this will get you into 173 out of the possible 219 countries. The worst is if you hold an Afghan passport. Only 28 countries will let you in without a visa. The reason for the visa is to restrict the risk of overstayers or asylum seekers. A visa allows the authorities to know who is coming and going.
So, keep your passport safe. It may be more valuable than you think!