Doppio and Guillermo 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 Guillermo's differentiating factor?In following section we will take a close look at what is Doppio and Guillermo color, serving style, types and much more. First thing to know is what are the different types of Doppio and Guillermo. Well, Doppio types include Espresso while types of Guillermo are Espresso.