Coke has a slight vanilla flavor that Pepsi doesn't have. I generally prefer Pepsi to Coke, but sometimes I have a taste for Coke because of that slight vanilla flavor.

On the other hand, I tend not to drink pop for long periods on end. My first pop in a long while always tastes incredibly syrupy, to the point where it's borderline unpalatable. If I have more than a couple of pops in a short period it starts tasting like what I 'remember' it tasting like.