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Both are crappy when in normal form. Diet Pepsi tastes like cat urine, and Diet Coke is pretty much the best soda there is (the only negative of mass consumption is high sodium intake).

Besides that, Pepsi steals every idea they can from Coke and makes no attempts to hide their blatant rip-offs. And when they make something original (which is rare), the result is something whose equivalent you may only find in hell. Remember Pepsi Spice? My god, they should fire the person who thought of that abomination.