Not that this hasn't already been reposted to death, but I'll say it one more time for the fvcktards who don't know...
The flavor highly depends on the bottler and the water they use...
Western NY pepsi used to be the best (by far) when Olean was the bottler.. that was sold to Jamestown, and now the stuff tastes like crap.
I used to think Pepsi here was slightly better than coke... now, coke easily wins hands down. If you go to the Orlando area of Florida, coca-cola's bottler uses better filtered water... while the sulfur smell/taste comes through in the pepsi... thus, down there, pepsi sucks.
But again... it depends on where you are... the taste varies from location to location.