I'm not flying to NZ to go to a New Zealand museum.
That won't even be 1% as good as the museums I mentioned above.
My son is obsessively into WW2 aircraft. The Australian War Memorial in Al's hometown has an amazing collection, including a Me262 (WW2 jet fighter, the only one in the world that still has the original paint) and a 163 (rocket powered fighter). But my son wants to see the Enola Gay (in Washington DC) and the collection at Duxford.
The Air and Space Museum... not gonna find anything like that in NZ.