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