Vega and ggplot2 use different basic grammars, and Hadley stated that "Most likely, it converges over time as both vega and gg2v become more mature, but there is no expectation that ggplot2 and gg2v will ever exactly match. Probably , it’s easier to think of gg2v as an alternative specification and visualization of the graphic DSL defined by ggplot2 " http://goo.gl/rWzLTe
But what are the main pros and cons of using one and the other?
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