Don't forget that PowerBI also has R embedded/integrated. There are some limitations in how you can use R to produce custom visualizations, but this tight integration is a real plus, in my opinion. Combined with the Excel-like functionality that is also embedded in PowerBI for data reshaping, PowerBI has a clear advantage in terms of flexibility and raw power. I personally can't speak to Qlik, but PowerBI has Tableau beat in this respect. Much of the data reshaping etc. in Tableau happens outside of Tableau. This can introduce some challenges in process.
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