R is better if your raw data is already tabular. I prefer Python if the raw data is unstructured / semi-structured. You can make the case that once Python has

R is better if your raw data is already tabular. I prefer Python if the raw data is unstructured / semi-structured. You can make the case that once Python has converted the data to tabular then move to R, but at that point I like the soup to nuts to be in one language.