The fund type you invest in will depend on your reasons for investing, your age and stage of life and also your risk appetite.
To find out what kind of investor you are and for other useful information check out some of the tools on sorted.org.nz including their Investor Profiler.
If you're still not sure after researching the options yourself, we recommend you consult with an independent financial advisor, preferably one with a fee-based structure, so they make a decision that is unbiased and not tied to commissions. We can't give you personalised advice ourselves.