My cousin-in-law only drinks "Mexican Coke" (but Mexicans drinking coca-cola in their country get HFCS-Coke too. Wikipedia says only mexican coca-kola produced for export is made with sugar).
Fortunately HFCS is no longer contaminated with mercury [0] [1] (or less contaminated?), thanks to the efforts of a whistleblower [2].
The last problem to deal with is how HFCS preparations might have more calories than listed on the label, on account of residual starch molecules that aren't split into glucose. Residual starch adds calories but don't affect the perceived sweetness.
I previously wrote about how the original soda products were herbal beverages: Coca-Cola is made with flavorings from the Coca leaf and the Kola nut, Root beer is made with roots, Dr. Pepper's 21 plant flavors, etc: https://news.ycombinator.com/item?id=17979670
[0] Mercury in High-Fructose Corn Syrup? - https://www.webmd.com/food-recipes/news/20090127/mercury-in-... (2009)
[1] https://www.iatp.org/documents/much-high-fructose-corn-syrup... (2009)
[2] FDA WHISTLEBLOWER SPEAKS OUT ABOUT MERCURY IN OUR FOOD - https://www.foodwhistleblower.org/fda-whistleblower-speaks-o...
[edit: added some words to first paragraph re sugar and Coca-Cola company's taste tests pre-new-coke.]