Pepsi tastes better than coke but that's totally my personal opinion and not the sort of thing that can really be agreed upon between any two people. You like what you like for whatever reason you like it but I don't give a shit because I like Pepsi because I like the way it tastes.
Diet soda tastes like shit because artificial sweeteners taste like shit. All the slick marketing in the world can't get around this fact.
my grandmother, who was born born in Nova Scotia, refers to carbonated beverages as "Soda Water." I've never heard this anywhere else, ever.