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