Nutrition-wise, the only really meaningful choice when buying milk is between regular (blue top) and reduced or low-fat (green top). Our comparison of supermarket "home" brands with more expensive brands found little difference in nutritional content (see our "Milk comparison" table below).
That's not surprising. By far the majority of milk in supermarkets comes from the same supplier – Fonterra. Home brands contain much the same levels of protein and fat as branded bottles. All milk also qualifies for the description "good source of calcium". Our advice: shop on price.