A choice of language depends on the need, and what you are comfortable working with to get the job done. In most cases, Scala works better when it comes to handling large data sets. Python works better when you are going to be handling small datasets and experimental purposes.
To give you a binary answer, my suggestion would be to go with Scala. Considering you will be working on bigger projects in production later. I’ve also written more about this here:
Let me know what you think.