I have the cap and espresso but since I'm pretty partial to my coffee extractions I've not tried either yet, so I can't help you there. The cola though to me tastes like Pepsi. I thought coke when I first tried it, but after sitting overnight it developed more of that clean pepsi flavor whereas to me coke is sweet and flatter.
Expresso is not like a coffee extraction . Its super creamy sweet and frothy like a 20 dollar starbucks coffee thing with all the whip cream and what nots IMO.
Disclaimer : Statements above are expressions of my opinion only and not to be taken out of context as a fact or any form of authority.

