What is Pepsi Vanilla?
It's the great taste of Pepsi with a splash of vanilla, for a taste that's smooth yet not too sweet. They don't make regular anymore, but you can still buy it from ebay if you're willing to pay the asking price.
What is Diet Pepsi Vanilla?
It's the same great taste of Pepsi Vanilla with no calories - it's light, smooth, and not too sweet.