I'm comparing Tableau with my previous experience using PowerBI. It seems to me that, generally, Tableau is much more complex, less focused on key functionalities from a data analysis perspective and more focused on data visualization. For instance, it is not possible to calculate measures with context, particularly relevant, time context (as it is on PowerBI). You have to prepare your data to this. Additionally, it is much harder to find people who understand how to operate, be it partners or employees, although it might be a limitation specific of my region (Brazil).
