First of all moving to New Zealand is often decided on many different very personal levels. There is no way to generalise how to decide on moving or which steps to take towards moving to NZ. All situations are unique and therefore have to be evaluated in their uniqueness.
Relocating to New Zealand and becoming expatriates was a quite spontaneous approach. We simply fell in love with this country while travelling and acted upon it. Generally I would encourage anyone who loves this country and can embrace it in all aspects to examine every possible way to make it home. There is no such place on earth that is perfect. The place simply has to be perfect for you and the needs of your family. Sometimes this is something you know straight away and sometimes it becomes clear after a visit.
For those fleeing a situation in their home country know as long as it is unresolved it will be part of your package.
For those comparing meticulously every single aspect, I would ask: Are you sure you want to do this?
For those doubtful if they can do it yet they see a probable chance. You have to give immigration New Zealand a try otherwise you will never know.
For all, New Zealand is a small beautiful country with a relatively small population, but they are just people, with a specific cultural mix.
Generally New Zealanders are proud, good natured and good hearted, friendly, and helpful. Sadly this does not exempt from violent or abusive individuals, they are just people. The good thing though problems get addressed often much faster and more pronounced, hence some get the impression crime is on the rise. Personal experience taught that things you expect or believe in more likely find a reflection in life.
When moving to New Zealand there will be a cost of living like food prices, housing prices, cost for utilities, and transport. They depend largely on consuming habits, location, and level of comfort, personal interest, and needs. Tax and gst are also no strangers to New Zealand. Costs occur too for medical consultations and prescriptions.
Since it is an independent country some of these costs compare higher and others lower than to other countries. Moving to New Zealand will change your habits and needs because it is a different place, therefore a straight forward comparison might mislead at times. Generally there is always a cheap way to do things and a costly way. It is as always in the hand of each consumer to decide what is acceptable to pay for which goods or services.
Therefore even if you think you get all the information together in before there might be surprises in one way or other. What it is like you will only know when you moved and settled in.