My heuristic is: if my program is going to be 80% NumPy and friends anyway then R is probably better but if it’s going to be only 20% (e.g lots of user interfac

My heuristic is: if my program is going to be 80% NumPy and friends anyway then R is probably better but if it’s going to be only 20% (e.g lots of user interface code or whatever) then Python is better. I probably wouldn’t use R for anything end-user-facing unless it was via Shiny, whereas I might use WxPython for a desktop app. For interactive, exploratory/research use R in RStudio beats Python in Jupyter hands down.