That's actually where competition is easy enough that it produces something worthwhile. Afri Cola and Fritz Cola aren't bad at all (even if their market share is only a footnote to Coke and Pepsi).
That is not how it works with beverages. They are just not substitutes for your favorite carbonated style drink. Once you are hooked on a subset of them - favorite cola, tonic, bitter lemon - the others will always taste a bit off. I moved from Dr. Pepper to cherry cola is not sentence often heard. Or vice versa.