America, New Zealand, Australia and Canada, which country is better for immigration?

Let me talk about the characteristics of each country first:

The United States: strong, high-tech, developed social progress, large population, noisy living environment compared with Canada, relatively high risk system, low prices, suitable for career development, in contrast, Canada is suitable for providing for the elderly; One more thing, immigration is extremely difficult.

New Zealand: High prices, underdeveloped industries, small and lonely population and low housing prices.

Australia: It's difficult to immigrate, and it's noisy. China has a lot of garbage and is relatively closed.

Canada: Life is comfortable, quiet and safe, with moderate development and low prices. There are still some opportunities for immigrants, but the temperature is relatively cold.