Spotfire is the best application for power users by virtue of its wide variety of visualizations, incorporated analytics, superior data canvas, and ability to integrate code such as R or Python. The learning curve is steeper and the menus are Windows 7 once you are past some superficial visual improvements. But the power is unmatched.
Tableau has a smoother web publishing platform and user access management. And to create reporting tables, as one might create in Excel, are easier. But it falls down in flexibility and overall analytics power. Power BI is a disaster all around, but it has tight integration with other Microsoft applications.