Prefer the taste of coke - even though it can also clean your bath (but also burns a hole through the enamel) - but I would rather drink neither as the feel of it on my teeth makes me imagine holes rotting through almost instantaneously...
Coke is awesomeness. It has more of a bite to it, but I do agree with the teeth feeling. Just gives you that "auto-rot" feeling. And Diet Coke is a good substitute. And if you believe in that "aspertame causes cancer" type of thing, then I say WOW......
Cancer? No. But a helluva lot of other strange symptoms seems to be linked to that crap.
It was approved way back in '81 where science wasn't what it is today, so until modern science proves it harmless(which seems to be proving the opposite as we speak)... well I like my brain without tumors.
The only thing I use diet coke for is the diet coke/Mentos awesomeness.