Well pepsi and Coca-cola is so easy to taste the difference. Just drink them and you'll know whenever you drink anything else.
Diet cocacola and normal coca-cola is easy as well. I think the diet version tastes as if it has a bit more sugar in it and the bubbles are different. diet tastes a bit like cherry-coke.
I haven't tried pepsi and pepsi diet so I don't know for those.
Cheap doesn't equal better and sometimes I can't taste the difference between cheaper and more expensive brands
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