Coke Zero vs. Pepsi Zero: Both sodas want your drink dollars. I remember the original Pepsi Challenge, back in 1975, when Pepsi shook the soft-drink world to its fizzy, caramel-colored core by ...

Pepsi is asking people out and about in Atlanta to sip from unmarked cups of Pepsi Zero Sugar and Coca-Cola Zero Sugar to decide which they prefer.

But the drink became a sensation, quickly catching Pepsi and Coca-Cola in sales ... may have served as the inspiration for Diet Coke's first commercial, the Prince of Wales reportedly follows ...