I think the question is are you likely to be more productive with python and its attendant ecosystem or js and the packages it has available (most saliently D3 etc.)
I was hoping for some more opinionated responses, but I guess the truth is always “it depends”
Asking between Python and R tends to get people to throw around opinions.
:D I mean personally I prefer Observable becasue my interest is primarily in data presentation. I imagine if you're more on the analysis side of things (tidyverse etc) Jupyter would still be the way to go.