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