The problem isn’t carbonation (Bubly, Liquid Death have 0g). The problem is carbonated sugary drinks typically have more sugar than other sugary drinks, not a rule but per amount sold.
The typical soda has 38g of sugar per 12oz (can). Google states the following: Coca-Cola is 45g. Mountain Dew is 46g. Redbull and Monster are 34g. Arizona Sweet Tea is 31g. Apple juice is 33g. Orange juice is 28g. Cranberry juice is 42g.
Anything over 28g is no go territory for me. Anything under is generally not an issue blood sugar wise for me. Note: I am not diabetic.