Also not to forget that Jupyter is just different to Mathematica. With Mathematica you can do symbolic computations, yes also Statistics and Machine Learning, but also Group Theory and what not. Jupyter does a great job as an interface for certain Statistics and Machine Learning tasks, also I'm quite sure that it needs less resources but that's all.

That said, I'm still missing a free but powerful tool for symbolic computations like Mathematica or Maple.

> The tie-breaker is financial.

Exactly, it cannot be emphasized enough. Of course as a student you get these powertools for a small price or even for free. But if you are not in University, those tools are super expensive. For a reason but there is still a need for far more open source in this area.

EDIT: I'm just realizing there is Sympy, niiceee...