Coke Zero is supposed to taste like real Coke but without the sugar and Diet Coke was designed as a stand alone flavour - it's not really meant to taste like original Coke.
I seem to have many more male customers who ask for Diet Coke than women customers. It seems to be addictive too - one can is never enough and I`ll never understand how people can wake up in the morning and ask for Diet Coke (disgusting stuff)
as wolf says, despite all the ads featuring office girls watching hunky construction workers quaffing Diet Coke, it was actually the typists, not the builders, who were buying it. So they had to come up with a Bloke Coke to serve the other half of the population, and Zero is it. Very different flavours. Diet Coke has citric acid and Coke Zero has sodium citrate.
RIP Tab, as featured in Back to the Future. (Though apparently you can still buy it in the USA.)
the main differences will be the amount of artificial sweeteners they use varying Aspartame , Acesulfame potassium and saccharine but in reality it is a marketing ploy to try and recapture some of the customers thay have lost to pepsi max
I can't tell the difference between coca cola and pepsi. I also can't tell the difference between diet or non diet of either of them. I also seem to be alone in liking any of them. Sorry.