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