I agree with @Reeza that bar charts are more effective than pie charts in the vast majority of cases. We, in the design team have come to acknowledge that it is compelling to people because it provides a different shape, feels more compactness, and provides more opportunities for color. The Donut variation of the Pie is also driven by an intent to modernize visuals rather then improved data visualization. While comparing adjacent arc lengths may be easy, it takes away the possibility of comparing angles, which we agree isnt the easiest on human eyes. So, yes to bar chart! 🙂
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