Diet Coke & Coke Zero--both have zero calories, but what's the difference?

I recently have tried Coke Zero, and while it tastes similar to regular Coke in a way, it has zero calories, just like Diet Coke.

However, after tasting Diet Coke and Coke Zero, I have tried with no luck to find any differences.

To those who have had both (not either), what differences have you been able to find? Please share them below. Gameshowguy2000 (talk) 17:52, October 25, 2015 (UTC)