There are other requirements:
Compatibility in all platforms.
For some resons, I have to use IE8, so I want a chart supporting it.
Supply iOS and Android native charts library for users.
Strong data analysis.
Including legend switch, data hotspot tip, chart linkage, auto refresh at regular time, series drag, drill down and scale.
Data display in multiple forms.
It’s perfect to support text, value, time, date, percentage, scientific notation, etc.