When comparing dojox.gfx vs NextCharts, the Slant community recommends NextCharts for most people. In the question“What are the best JavaScript drawing libraries?” NextCharts is ranked 19th while dojox.gfx is ranked 24th. The most important reason people chose NextCharts is:
Besides having all consecrated charts like line, area, bar, horizontal bar, pie, bubble , it can have styles for line dots (solid dot, hollow dot, star, bow, anchor) or bar types (like dome, cylinder, parallelepiped). It has support for stacked bars, negative bars, combo bar-line charts, dual axis, click events and tooltips.
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Pros
Pro Cross platform
GFX can use a variety of formats to render (SVG, VML, canvas and SIlverlight). It simply does not lock you into one single browser's implementation of vector graphics.
Pro Great diversity
Besides having all consecrated charts like line, area, bar, horizontal bar, pie, bubble , it can have styles for line dots (solid dot, hollow dot, star, bow, anchor) or bar types (like dome, cylinder, parallelepiped). It has support for stacked bars, negative bars, combo bar-line charts, dual axis, click events and tooltips.
Pro Free
Completely free and open-source as it uses the Apache license.