During development, I also discovered small, pleasant surprises which Tableau has in store. If you assign certain colours to a data value (for example, product categories), Tableau remembers this assignment and automatically uses the same colours for the next visual with the product category dimension. Power BI has yet to offer this feature to developers.
Measures are created similarly with both tools. An advantage of Tableau is that measures can be calculated at row level, and are therefore easier to write, especially for beginners. I had no opportunity to gain experience with complex measures in Tableau.
To sort a column's values, a sorting column is needed in Power BI. This problem is solved more easily in Tableau: Via drag & drop.
Another cool feature is the ability to add comments to individual data points. This can be a useful option for presentations.