Both languages can serve as a great foundational programming language to learn. JavaScript could come in handy if you are interested in developing web applications or a web-based frontend for your application. Python could be a better choice if you want to build an application without a web frontend. Learning Python could also enable you to explore machine learning and data processing libraries if that piques your interest. Either language could serve you equally well in this case.

Frameworks are great for speeding up development work, but I recommend getting a solid understanding of a programming language before attempting to learn frameworks. Knowing the basics before branching out can save you from unneeded frustration.
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