For grouped bar chart it's better not to use more than 3 bars per group. Otherwise that chart becomes cluttered and it's extensively harder to read chart and compare separate bars.
In stacked bar chart it might not be easy to compare segments that are part of different bars. If you want to compare segments you might need to use grouped bar chart. Fortunately in Datylon bar chart it can be done in one click.
Comparing stacked bar charts that include segments with negative values can be misleading, as it may distort the overall interpretation of the chart. If your data contains negative values in one or more segments, consider using a grouped bar chart instead. This approach provides a clearer and more accurate representation of your data in such cases.
The rule of thumb for using labels in bar charts is to use data labels instead of axis labels and axes themselves. By using only data labels the visual clutter is reduced and the essential information is provided.