Visualization of proportions is a very common need and there are many techniques for it. Pie chart is popular among practitioners and general audience, but many prominent experts advice against using it. This paper reports an experiment where the pie chart is compared to stacked bar charts with a baseline condition of table. The aim is study if the performance differences justify the bad reputation of pie charts. In the experiment the participants were requested to list out the elements of a visualization in the decreasing order of their size. The task time and the answer were recorded. The results show that the pie chart is slower and less accurate than the stacked bar chart, especially when the difference between the elements is small, but the participant find it slightly more pleasant to use. The participants also perceive the stacked bar chart as the most effective visualization. Keywords-visualization of proportions; pie charts; stacked bar charts 2 Method 2.1 Participants Twenty-eight students volunteered to participate the experiment. Twenty-three participants were recruited in May