Well NZ obviously feel Pfizer is superior, as they have decided to order enough for everyone and wait for that delivery, despite having other options available.
It cant be cost, because AZ is less expensive than Pfizer and has lower transport and storage costs too. There must have been some advice to come to the decision to spend more and wait longer for Pfizer over others. Otherwise why wouldnt NZ buy AZ and get it sooner?
From ABC:
New Zealand will buy additional COVID-19 vaccines, developed by Pfizer Inc and Germany's BioNTech, which will be enough to vaccinate the whole country, Prime Minister Jacinda Ardern says.
The government has signed an agreement to buy an extra 8.5 million doses, enough to vaccinate over 4 million people, Ardern said, adding the vaccines were expected to reach the country in the second half of the year.
"This brings our total Pfizer order to 10 million doses or enough for 5 million people to get the two shots needed to be fully vaccinated against COVID-19," Ardern said in a statement.
The government's original agreement with Pfizer was for 1.5 million doses, enough to vaccinate 750,000 people.
Ardern said the decision to make Pfizer the country's primary vaccine provider was taken after it was shown to be about 95% effective at preventing symptomatic infection.
New Zealand started its national rollout of the Pfizer-BioNTech's COVID-19 vaccine last month and expects to inoculate its entire population by the end of the year.