Working on a mixtape right now actually.

I can't really speak to R, having barely used it, but Python is definitely better to know in general, given that it is heavily used for scientific computing/data science and many other domains. Zillabyte's original API is actually for Ruby, and we just started supporting Python recently.

Ultimately, R vs Python comes down to a preference in tools. R has a large community and is specifically designed for statistical analysis, so a lot of statisticians. I would feel weird recommending a tool I don't actually use, but that's not a knock on R, just a lack of need on my end to learn it.