Long Black 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 Long Black and Oolong Tea's differentiating factor?In following section we will take a close look at what is Long Black and Oolong Tea color, serving style, types and much more. First thing to know is what are the different types of Long Black and Oolong Tea. Well, Long Black types include Espresso, Ristretto while types of Oolong Tea are Yu Lan Xiang, Xing Ren Xiang, Zhi Lan Xiang, Po Tou Xiang, Huang Zhi Xiang, You Hua Xiang.