I like top left. Retains the Southern Cross and a bit of colour from the old one with image/colour that is unmistakenly New Zealand.
Top right looks like a revamped NZRFU logo. Bottom left needs too much explanation and/or looks like a rams horn or a black elephant having a drink. Bottom right is a bit like top left but I think the black looks better with the fern.
As an aside. I like any flag that displays the Union Flag as it guarantees getting it the correct way up!
I notice the Chinese managed to get it upside down at the IAAF World Championships.
Perhaps if the Scots had left the UK it would have meant those w*****rs who fly the Union Flag in their garden wouldn't keep hanging it upside down.