Well, I have to disagree with you on the Pepsi thing. I can't stand the stuff, regular or diet. I way prefer classic coke (back to coke) The "new coke" tasted like pepsi and yuck. I couldn't stand it. RC cola for the sugary kind is my favorite, and I drank it when I was pregnant instead of my usual diet, but it's hard if not impossible to find around here (did they go out of business?)
Personally, I think it's just that Pepsi has more sugar/sweets. For a sip, it tastes better, but for a whole glass full, it's overwhelmingly sweet and sickening. Thus, people actually like Coke better - to drink. Even sugar free Pepsi is sweeter, plus they use that new sucralose? is just like sugar, it coats your tongue like sugar. I prefer Aspartame because it remains refreshing while giving a light flavorful sweetness, LOL
And that is why, I believe, Coke really is outselling Pepsi. Because those advertisements from the 70's and 80's were in fact working and pepsi was outselling Coke. Coke held on to their lead by a nail because of their foothold in fast food joints and soda machines. Eventually Coke made "new coke" with more sugar to compete, but got such a backlash because their fan base couldn't stand the sugar. Ultimately, both have their fans and of course choice is key.
Warren Buffet said in a speech I watched, that Coke was unique in that you don't get tired of it's flavor. I have to agree with him, though I don't know if it's true. My kids like Dr. Pepper, but they only drink a little of it at a time. I'm completely hooked on Diet coke, drink it every day undoubtedly to the detriment of my health. I add a ton of ice and let it melt in hopes of saving my kidneys and liver and anything else, LOL, but I doubt it helps. So don't misinterpret my words as making me out to be a Coke fan girl, I'm more of a user and addict, unfortunately.