I know all fountain Coke is supposed to taste the same, but one time a lady told me that McDonald's fountain Coke tastes the best. I didn't think much of it at the time, but that comment stuck in my head. From there on I always payed attention to the taste of any fountain Coke I got, whether from McDonald's or wherever... I can say now, I definitely agree with her, McDonald's does have the best fountain Coke.
BUT I was surprised at how good WDW fountain Coke is. To me it is nearly identical to McDonald's... Something about that fizzy fountain Coke that just washes down your food so well haha.
Sry if this is off topic, just thought I'd throw it out there.