It seems to me many of these tests are asking pie charts to do something they&#x27;re really not meant for. Sure, you can create a synthetic problem and dataset where you need to order four different categories, all comprising around quarter of the whole, and there a bar chart would excel.<p>But that&#x27;s not actually that common a use case: a lot of the time, I&#x27;d only be interested that they are all roughly a quarter of the whole, and not care beyond that (providing a ranking of small differences can actually be pretty misleading, depending on the problem you&#x27;re trying to answer).<p>I can just as easily say, I want to know roughly what proportion of the whole a category comprises. And with widely varying category sizes, the pie chart excels, while with a bar chart I&#x27;d have to sum the bar sizes in my head, and divide that total by the category in question. That&#x27;s at least as taxing as having to differentiate between small differences in pie slice sizes.<p>The answer isn&#x27;t &quot;always use pie charts&quot; or &quot;never use pie charts&quot;: it&#x27;s to use what&#x27;s best for a particular situation and context.