I'm not sure if this is a personal question or not but I am going to take it as it is.
Personally, I like Coca-cola than I do Pepsi I have to say for a pepsi it'd be 5/10.
I don't really enjoy drinking diet soda's because the ingredients so I have to say 3/10.
This is my personal opinion. You can easily answer this question if you drink soda and if you don't just add that into your project.