In the Oshawa area
Burgers: Mr.Burger blows 5 guys out of the water in quality and price and most importantly TASTE! 5 guys has a Wendys flavor to it and lacks the homemade taste in my opinion.
Pizza: GOGO Pizza and Subs is the best in Oshawa. Hardy Pizza and good enough that dipping sauce is not required. Also did I mention you can walk in order a slice and enjoy it with a beer?