No no, Pepsi and Coke is an amazing analogy. Red vs. Blue, hundreds of years of brand loyalty, people say shit like "we're a Pepsi household", both are really not good for you. Only meaningful difference is the color on the label.

Comparing McDonald's to Burgerking is just crazy talk because everyone I've ever met will agree that Burger King sucks. But start them on Pepsi VS. Coke? You might start a fight.