Mississauga is a very large suburb of Toronto that is really its own city. Toronto is the largest city in Canada and is the business capital of the country.
Mississauga is definitely cheaper. Toronto has much better public transportation if you don't own a car.
Mississauga is not cheaper. I live near Squareone Mall and its as expensive as down town toronto. Its very noisy where I live, especially on weekends. There r many restaurants that r allowed to open till 3 AM.