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Perhaps you consistently notice this because you drink one (or the other, or both) regularly and your sense of taste is calibrated. Anecdotally, I drink soda very infrequently, and can't tell the difference; both just taste "extremely sweet."

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Coke has a much greater acidic, carbonated "bite." Should be obvious after a few moment's instruction.

I can tell the difference between Coke, Pepsi, Diet Coke, Diet Pepsi, fountain or bottle or can, and often which fast food establishment the coke came from if it's fountain. There's nothing about special about it, anymore than telling the difference between tuna and toro. After a bit of experience, it's not challenging.

This, and it has nothing to do with drinking so much about one brand. Coke, Diet Coke, Coke Zero, Pepsi, Pepsi Lite, Dr Pepper, Or even some Sainsbury ( UK Supermarket ) Branded Coke. They are God Damn Different.

Not only that, Coke from UK, US, HK, Japan and Mexico taste different as well. Big Bottle 1.5+L taste different to 330ml can, along with Glass Bottled Coke.

And I don't drink them often. May be once every few months or a year.

Note: I never tasted the US version of Pepsi though, so may be they are similar.

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