Would probably learn Python. Using R is a pain in the ass for everything that isn't statistical related. For quick visuals, it can be easily done in Tableau or POWER BI.
python actually has a good collection of packages for data visualization and also has pandas for dataframes so that's what I would suggest. If you need more specialized statistical models then R is probably better.
R is better if you are a statistician, as it was designed primarily for that. For everyone else, learning Python has the added advantage of knowing a general purpose language that you can use for other projects