Python is a beginner friendly, easy to learn and adopt. On the other hand, JavaScript is most complex modern programming language comparatively to python.
Python is one of the most versatile programming language suited for fields such as Web Development, ERP development, and AI, ML and Data Analytics Development. Whereas, Javascript is also quite handy when it comes to Web development, ERP development, but considering the future market trends of AI/ML Javascript is not well suited.
Now talking about future opportunities, since AI and ML is already the next big thing in the industry, and Python is the preferred language for implementation of such technologies, you can go ahead and go for Python without having to worry about it going out of trend.
Why don't you start with this tutorial video?