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.
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ZoomCharts patented technology called Charts-on-Charts, which allows to dynamically build multiple interactive charts inside one canvas object.
ZoomCharts is built for mobile devices. All native multi-touch gestures are built in. Data navigation and exploration is as native as it could ever be.
All ZoomCharts products have high level of interactivity available.
Pro Speed & Performance
ZoomCharts are canvas based, as tested with default settings, more than 20 times faster as svg based competitor with same data and default settings. Video available on ZoomCharts youtube channel.
Pro Extensive documentation
Most of ZoomCharts customers do comment that ZoomCharts Documentation is one of the best that they have seen
Pro Fantastic Support
They responded to my issue/question really amazingly fast and that means I didn't have to halt my project development. Also the attitude was great.
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 Very expensive
Con The examples are not that great
For instance, example's JsFiddle may get stalled when loading.
Highcharts is not free for commercial projects, with a starting price of US$590 for Single Developer + Maintenance & Support