When comparing Xceed WPF toolkit vs ZedGraph, the Slant community recommends Xceed WPF toolkit for most people. In the question“What are the best free controls for .NET?” Xceed WPF toolkit is ranked 3rd while ZedGraph is ranked 6th.
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Pros
Pro Free for non-commercial use
Pro Great resources
With a plethora of tutorials, samples, and source code available, ZedGraph makes it an easy control to jump in and use. There are descriptions and examples of editing all aspects of the graphs as well as telling you in-depth what each component does.
Pro Scalability
ZedGraph comes with all option defaults in place so a user can create their graph with as much or as little detail and customization required. Also, with the multiple different types of graphs and charts able to be made, this is a control that could be used in many projects.
Pro Free to use
Cons
Con Limited free edition
The free edition does not offer a DataGrid, which is one of the most useful controls.
Con Difficult to get support
Most open tickets no longer receive any replies, and the last ticket to be closed was back in 2012.