Coke Zero tastes more Pepsified. Sweeter. I think it's the Coke Light beloved of foreign heathenry, but as we had differently formulated Diet Coke, this was the only way they could smuggle it into the country. Possibly I made all this up. It's the internet, shadowy land of half-truths and outright lies, and this is my post and I can make things up if I want to.
Anyway, it's still the equivalent of over four spoons of sugar per can. This is apparently their commitment to our health. Sugar solution is sugar solution and it's pretty much going to kick you in the liver and pancreas as soon as it hits your stomach. Sugary soft drinks are the worst thing ever. All instant calories, ready dissolved and on the highway to your hepatic portal, where it can wham your insulin gong like it's fairground hammer contest.