I work at a big bank in quant research. I can easily say that open source tools are favored here over their more expensive counterparts. Futhermore, over the la

I work at a big bank in quant research. I can easily say that open source tools are favored here over their more expensive counterparts. Futhermore, over the last few years I've definitely seen a shift away from R and toward Python. NumPy, SciPy, Pandas libraries in Python are all excellent (and way faster) than equivalent options in R.