Which DAX function should you use to create a formula that lists the 10 best-selling products sorted by total sales?

The DAX function to create a formula that lists the 10 best-selling products sorted by total sales is TOPN. This function is specifically designed to return a table that contains the top N rows of a specified table, based on the values of a certain column.

When you want to identify the top 10 products based on total sales, TOPN allows you to define both the number of rows to return (in this case, 10) and the order in which to sort those rows (by total sales). This is particularly useful for ranking purposes, as it directly provides the top entries without additional processing.

Furthermore, since the TOPN function generates a table, it can be directly used in reports and visualizations to display the desired results effectively. This flexibility makes it a powerful choice for reporting best-seller lists within Power BI dashboards.

The other functions mentioned do have their specific applications, but they don't achieve the same outcome of directly returning a sorted list of top-selling products based on total sales. For instance, RANKX is used to rank items but would require further steps to extract the top 10, while MAXA and MAXX are intended for calculating maximum values and are not suited for listing multiple entries based on a parameter like sales.