I liked both NZ and Oz. If you have not much time, it's probably better to go to the Green Sheepy New Zealand. In about 5 weeks you can see and do a lot and travel through both north and south. You wouldn't see all of it of course, but you wouldn't feel as if you are in a rush either. For Australia you need a lot more time and there are more extremes in nature (rainforest, coral reef, desert, rocks, mountains). But in New Zealand you have a lot of different things near each other.
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