Vanilla ice cream is superior.
1. Versatility - How many root beer floats are made with chocolate ice cream? What about on pies?
2. Longevity - Chocolate must constantly innovate itself to remain popular. Fudge Brownie, Triple-Chocolate, Chocolate with chocolate chips. Vanilla, being better, is not as modified, and retains more of a pure state.
3. Uses - There are many other flavors of ice cream that rely on vanilla for their existence, such as Cookie Dough. Even chocolate is dependent upon vanilla; Chocolate Chip and Fudge Swirl!
4. IT'S SHINY!!!