Please give your location. If you’re in the US please give a region as I expect it to be more fractious there. If we assume Coke and Pepsi are the top 2 colas in terms of name recognition/sales, (not necessarily your personal taste, not judging your personal tastebuds), what is the 3rd cola? Also, maybe it’s not even a 3rd cola, it’s made parity with or exceeded the big 2. Only colas, not other flavoured fizzy drinks like Dr Pepper.
Living in England I’d say Barr’s has to be the de facto 3rd cola.