If you are comparing TM1 and Power BI, you are asking the wrong question. These are not competing products. They solve fundamentally different problems. TM1 is a planning engine, and Power BI is a visualisation platform. Comparing them is like comparing an engine to a dashboard: one produces the power, and the other displays the information. The real question is: when do you use each, and how do you connect them? The Core Difference in One Sentence TM1 writes data. Power BI reads data. That is the entire architectural divide in eight words. IBM Planning Analytics (TM1) is a database where ...