"Coke or Pepsi?
The cola wars used to provide the best example we had of a functioning free market. Whether you bled red for Coca-Cola or were true red, white and blue for Pepsi, most people had a preference and no one really could argue that they were all that different. It was a perfect competition.
These days, the battle for taste rages between Sony and Microsoft, between PlayStation 3 and the Xbox 360. "