Ristretto and Oolong Tea are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Ristretto and Oolong Tea's differentiating factor?In following section we will take a close look at what is Ristretto and Oolong Tea color, serving style, types and much more. First thing to know is what are the different types of Ristretto and Oolong Tea. Well, Ristretto types include L'autentico, vanilla while types of Oolong Tea are Yu Lan Xiang, Xing Ren Xiang, Zhi Lan Xiang, Po Tou Xiang, Huang Zhi Xiang, You Hua Xiang.