When comparing jqPlot vs Metrics Graphics, the Slant community recommends Metrics Graphics for most people. In the question“What are the best open source JavaScript charting libraries?” Metrics Graphics is ranked 9th while jqPlot is ranked 13th. The most important reason people chose Metrics Graphics is:
All the power and flexibility of D3.js.
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Pros
Pro Charts update automatically
Content renders as an image and can be updated automatically with Ajax.
Pro Built on D3
All the power and flexibility of D3.js.
Pro Declarative interface
Declare the type of chart, the x and y variables, and other chart properties. No unnecessary manipulation of data objects into separate arrays for each axis.
Cons
Con No longer supported
If you are just starting off with a JavaScript charting library you shouldn't invest your time learning jqPlot. Once a great tool it hasn't been updated in several years and there is virtually no activity on the Google Groups forum these days.