Given a set of data $A$, we can plot it on a radar chart. One can permute the axis to make sure the area of the radar chart is maximized. This was explored in a previous article.
More interesting problem. Given two sets of data $A$ and $B$, we are interested in finding a common radar chart, that make $A$ look as good as possible compared to $B$. We might want to optimize the area ratio, area difference, or something else. Again, we are thinking of permuting the axis of the radar chart.