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Re:Polychart.js: An Interactive Charting Library by oscilloscope on Tuesday April 09, 2013 @03:16PM (#5520458)
It's hard to evaluate when the projects are so new. It was a similar problem with Crossfilter/Datavore/Data.js/Miso Dataset when they all came out.

If I had to pick, I'd go with Vega because I think it has the most potential to develop a community around it. Especially as a bridge between Python/R and D3.js through JSON. Think iPython notebooks, R Shiny, etc.

Re:Polychart.js: An Interactive Charting Library by HarshaThota on Tuesday April 09, 2013 @03:57PM (#5520837)
Perhaps this is not the right place but can you expand on the Crossfilter/Datavore/Data.js/Miso Dataset comment?
Re:Polychart.js: An Interactive Charting Library by oscilloscope on Tuesday April 09, 2013 @05:08PM (#5521393)
They are all libraries for managing datasets with fast or convenient filtering. Useful for linking visualizations together through a common data model.

None have become as popular as d3.js though, so it's still hard to compare them.