When they could not get sugar, during WW2, they went to corn syrup. Aside from being sweet, it was also much cheaper.
After the war they stayed with corn syrup, as it was still MUCH cheaper.
Aside from "throwbacks" and "retro" mainline drinks, and "Mexican coke", I've never had soda made with sugar.
I have, however, had Mexican coke, and "throwback" Dr Pepper and Pepsi.
The stuff with corn syrup is better.
Why would I say such a blasphemous and patently untrue thing, you ask?
Because the stuff with corn syrup is what I'm used to - what I've drank all my life. So it tastes better - to me. It's all about what you're used to.