It is definitely a lot cheaper in my humble opinion. Also my dad worked at BK for the first half of my life, so since I was surrounded by BK for a great amount of time, I can't even go near a BK to save my life.
We don't have a burger king in Australia, I dont think so anyway. McDonalds may be unhealthy but it does taste quite nice as a sometimes treat.
I love McDonald's! Their Big Mac tastes like savory heaven and their fries are the best fries I've ever had! Their smoothies are delicious and so are their shakes. Also, the employees are mostly friendly towards you and give you what you ordered, most of the time!