R has better data manipulation, algorithm support (outside of neural networks) and visualisation. Speaking as someone who has to maintain environments for a team of data scientists, getting R and RStudio Server installed with Intel MKL support etc is trivially easy. Getting JupyterHub, Python, Anaconda and your own compile of TensorFlow all up and running is _excruciating_ so I don't really buy that one ecosystem is provably better than another even if I think R is a horrible language in comparison).