When comparing Highcharts vs GraphicsJS, the Slant community recommends GraphicsJS for most people. In the question“What are the best JavaScript drawing libraries?” GraphicsJS is ranked 10th while Highcharts is ranked 18th. The most important reason people chose GraphicsJS is:
Not only Bezier curves but also any lines, shapes, arcs, etc. out-of-the-box.
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Pros
Pro Good documentation
Very handy with examples and explanations.
Pro Excellent browser support
Highcharts supports all modern browsers (including IE6 and up), iOS and Android.
Pro Large and active community
Highcharts has a large and supportive community, resulting in a fast response from both stack overflow and the Highcharts forum.
Pro Lots of good examples
The site has a selection of good examples that will help you get started quickly.
Pro Supports multiple Y axes
Important for trend correlation, eg. comparing number of clicks to sale amounts. Not same scales / units.
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 Powerful line drawing
Not only Bezier curves but also any lines, shapes, arcs, etc. out-of-the-box.
Pro Convenient API
Clear and concise API with chaining support.
Pro Virtual DOM
Rapid drawing. Only what is necessary is drawn.
Pro Has its own transformation engine
No need to use embarrassing in-browser transformations.
Pro Legacy browser support
IE6+.
Pro Smart layering system
With z-index.
Pro Rich text features
Multiline text support, text measurement, wrap, indent, spacing, align, etc.
Pro Full accessibility (Section 508)
Pro Events support
All browser events are dispatched in the same way in virtual DOM structure also.
Cons
Con Commercial
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.