Highcharts provides 20 different types of [charts](http://www.highcharts.com/docs/chart-and-series-types/chart-types) to choose from, and they make it simple to [combine](http://www.highcharts.com/docs/chart-and-series-types/combining-chart-types) chart types.
Ranked in these QuestionsQuestion Ranking
Pro Works across devices and browsers
Charts can render across devices including iPhone, iPad, Android, Windows Phone, Desktops, etc.
Pro High performance
Charts can render tens of thousands of data points without any performance issues.
Pro Free for non-commercial use (Creative Commons Attribution-NonCommercial 3.0 License)
Pro Start-up friendly
Offers discounted pricing for start-ups and new companies.
Pro Good commercial pricing
A single developer license for CanvasJS costs $299.
Pro Supports 24 different chart types
Supports 24 different chart types including line, column, bar, spline, area, pie, doughnut, stock charts, etc.
Pro Excellent browser support
Highcharts supports all modern browsers (including IE6 and up), iOS and Android.
Pro Lots of good examples
The site has a selection of good examples that will help you get started quickly.
Pro Library to support Microsoft .NET
Compatable with .NET framework 4+, can develop graphs from server side for ASP .NETand ASP .NET MVC applications.
Pro Good documentation
Very handy with examples and explanations.
Pro Supports multiple Y axes
Important for trend correlation, eg. comparing number of clicks to sale amounts. Not same scales / units.
Con No drill-down
There is no drill-down possibilities built in.
Charts lack interactivity features.
Con Cost for commercial use
Highcharts is not free for commercial projects, with a starting price of US$590 for Single Developer + Maintenance & Support
Con The examples are not that great
For instance, example's JsFiddle may get stalled when loading.