The biggest difference IMO is that there is no default data representation that 99.99% of people use in javascript like pandas/dataframes/numpy/zoo in python/R.

The biggest difference IMO is that there is no default data representation that 99.99% of people use in javascript like pandas/dataframes/numpy/zoo in python/R. I would even say javascript has better visualization libraries than GGplot but because there is no javascriptDataframe.plot('line') the visualization libraries end up down their own path because of different data representations. My experience also is that every visualization library will lack something if you want to do anything beyond the most standard visualizations. Almost by definition it has to be that way.