Cupcakes are, without any inkling of doubt, infinitely better than eating a slice from a larger cake.
Go ahead, argue with me. I’ve got my retort warmed up and ready to go:
The whole is always better (or, in this case delicious) than the sum of its parts.
Here’s a (non-food) example for ya: Would you rather be a Little Person? Or someone whose legs were chopped off mid-thigh?
See? Better to have it all in a smaller package than be missing out on something potentially great, like extra frosting. Or the ability to run.