Glass, best but too expensive, too little coke though maybe thats a good thing.
Can's, as said often too fizzy but often feel more refreshing.
Small plastic bottles, meh, tastes pretty different and not great.
Big plastic bottles I find the coke tastes different to the small ones, maybe because its open longer and airs more, or something, theres a difference though.
Weird european/middle eastern coke you often get from takeaways, tiny corner shops with foreign writing and often in the 1.25l bottles, awful, different coke recipe, awful awful stuff.
Personally I'm a diet coke drinker, normal stuff gives you that "my teeth are covered in sugar and are actually melting" feel which I can't stand. Find diet stuff far more refreshing without the sticky sugar after taste. Diet Cherry is great, vanilla was half decent, lemon was pretty good on occasion, the newer one, is it citrus or some crap, I don't like at all.