The Pepsi cherry zero sugar tastes exactly like the sugar version.
Artificial sweeteners are not sugar and only taste "exactly like" sugar to some percentage of the population. Hence all the different sweeteners. So count yourself lucky that pepsi zero does not taste awful to you.
First random article about it on google:
https://www.phillymag.com/be-well-philly/2013/08/22/study-fa...
More recently, I tried the Dr Pepper Zero and I like it very much as well. I have long been a fan of real Dr Pepper, but I just don't want that much sugar in my life. Diet Dr Pepper is gross, though I know people who like it. Dr Pepper Zero is close enough to the real thing that I don't feel like I'm missing out. I even inadvertently bought a pack of real Dr Pepper (the bottles are the same color!) a few months back and drank one without realizing I was drinking the full sugar version. That's quite a compliment to Snapple for their formula.