Doppio and Espresso Romano are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Doppio and Espresso Romano's differentiating factor?In following section we will take a close look at what is Doppio and Espresso Romano color, serving style, types and much more. First thing to know is what are the different types of Doppio and Espresso Romano. Well, Doppio types include Espresso while types of Espresso Romano are Espresso, Cappuccino, Macchiato, Mocha, Red Eye, Palazzo, Iced Coffee.