China is a better neighbor to us here in NZ than the USA
For the Kiwis, it's not "US or China," it's "US or Fiji" or even "US or France." Most of the South Pacific (i.e. New Zealand's neighborhood) isn't a very fun place to live, and the folks in Wellington would like to keep that from happening to their own (surprisingly expansive) corner of it.
The Chinese really don't care who's in power in any particular non-Sinosphere country (if anybody) so long as they have buyers. In contrast, the US (and Australia and France and...) has actual people and territory at stake in the region and have a vested interest in things like local coups, fishing rights, pollution, high-seas piracy, etc.
In that respect, the US government has been relatively consistent (for better or for worse) and has helped to establish order (for better or for worse) in the region. In that respect, the US is at least a known evil, and isn't the one currently trying to "test" nuclear weapons in American Samoa.