'Cause we are diverse and cosmopolitan and simply unlabelable. You fullas are all the same, though;p

No, back to seriousness...
Both Christchurch and Wellington offer the attraction of a large city; Christchurch, as the smallest of the three, does it in the most compact and accesible manner. Also, since it doesn't have the same kind of sprawling CBD of anonymous concrete edifices, it's easier for a casual visitor to appreciate the visual side of the city's history. The truly historic buildings in the heart of the city, right next to the "English" touches like the boat sheds and bridges across the Avon. As far as history and culture are concerned, Christchurch is difficult to beat. The climate is comfortable - even in the heart of winter, when it's cold enough to snow, the generally dry atmosphere keeps it comfortable. Many other centres are known for their rather high rainfall; such is not the case here. Warm in summer, beautiful in winter. Christchurch has the virtue of providing both a vibrant and colourful life - socially, culturally, artistically, etc - without being overwhelming, and without compromising on the gentler side of things.