I use Python for data manipulation through Pandas, Machine Learning algorithm with Numpy and Scikit-learn. Also, to train powerful Deep Learning models using Pytorch and TensorFlow (among other libraries).
I use R program to run novel statistical models, plotting and programming.
I use C++ as a tool to improve programs running on R. For example, a MCMC method writed in C ++ and integrated in R is much more efficient than using only R.
I use it a lot at work because it runs fast and is easy to use for several statistical models. Also, it was the first econometric program that I learned at college.