All three are independent, high-income nations with British heritage. The “best” depends on your priorities.
Pros: High quality of life, strong economy, multicultural, universal healthcare, free K–12.
Cons: Cold winters, high cost in major cities, remote.
Pros: Warm climate, beautiful beaches, strong economy, multicultural, universal healthcare.
Cons: High cost of living, vast distances, dangerous wildlife.
Pros: Stunning scenery, mild climate, strong economy, multicultural, universal healthcare.
Cons: Remote, small population, high cost of living.
Choose Canada for urban diversity and cold tolerance; Australia for beaches and warmth; NZ for landscapes and quiet.