"University of Auckland is the best university in New Zealand," an international student in the study said. "There are cheaper options, but this is the best one."
Another, who first came on a temporary visa, said: "I lined myself up a job, went home, packed up and came back."
But participants said family life, and cultural and social community networks were important factors in remaining and settling in the city.
"Those who chose to settle in Auckland came initially because they were advised, or discovered, that it had the edge in work or educational opportunities," Ms Krishnan said.
"For migrants from China, issues of access to a vibrant Chinese community were very important."
One Chinese participant, who moved to Auckland from Christchurch, said: "I don't have any friends there, that's why I'm always in Auckland. [Christchurch] is very, very quiet ... it's hard to find some shops and Chinese restaurants. Auckland got lots of Chinese restaurants."
Migrants from China sought to maintain an almost exclusively Chinese social life, the study found.
Of those who came as skilled migrants, all intended to start or raise a family in beneficial circumstances, and a family home and good schooling were of top priority.
"It's all about school zones," one young father said.
The report said that migrants who arrived in Auckland usually came without prior personal knowledge, unlike Wellington where migrants moved there after visiting other cities.
The department will do more urban studies to better understand the strengths of cities and communities.
WHY AUCKLAND?
* "In terms of employment, there's more variety in Auckland than there is in any other centre in New Zealand."
- Skilled migrant
* "Auckland's got lots of Chinese restaurants."
- Chinese migrant
* "Auckland University is the best university in New Zealand."
- International student.