I am moving from Australia to Alberta for 1 year. I will need to get a car. Should I lease or buy?

Moving abroad can be stressful especially if you have lots of things to bring. If I were you, I would bring a car when you move there because leasing can be more expensive. For a year of lease you can buy another car, so you can save your money if you bring your car. You can check globalrelocations.com regarding it and see if you can bring your car and how much they would charge you for that. There's no harm in asking them.