Charts - Do you use bar graph rather than pie graph?
Line graph Line graphs are used to track changes over short and long periods of time. When smaller changes exist, line graphs are better to use than bar graphs. Line graphs can also be used to compare changes over the same period of time for more than one group.
Pie Chart Pie charts are best to use when you are trying to compare parts of a whole. They do not show changes over time.
Bar Graph Bar graphs are used to compare things between different groups or to track changes over time. However, when trying to measure change over time, bar graphs are best when the changes are larger. https://nces.ed.gov/nceskids/help/user_guide/graph/whentouse.asp
This is a fancy way of saying use the right graph for the right purpose. Pie graphs fulfill a specific requirement, unlike a bar graph which is more multi-purpose.
Pie graphs are used to show the general composition of an element. It's good for seeing at a glance what section is dominating, but it doesn't handle details very well.