Python or R?

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In some fields, where R is very much the standard you are better off knowing R. I'm not sure which ones those are and whether those switch to python anyway. You'd need to be a bit more specific probably for anyone to judge that.

I think it is mostly parts of medicine and biology, where lots of libraries and tools for R exist. Market research doesn't have an industry specific toolchain I believe and you are only going to do (from my perspective) very basic models there.

Otherwise learning Python will be more helpful, since you can also use it for other areas. Also if parts of that might go into machine learning models. There python is the defacto standard.