Dear fromagenator,
The title should answer your question. But in case it is not clear enough, let me tell you why. We used to go to Big Boy's instead on Tuesdays but when Leonard got incredibly attracted to Penny (who was working there as a waitress), I was forced to go there for dinner instead. To my utmost surprise and utter shame, the cheeseburger there had a much more satisfying meat-to-bun-to-condiment ratio even though it was a single-decker. I think that is exactly why it tastes better, actually.
For more information about cheese, please visit http://www.cheese.com/
-Dr Sheldon Cooper