Python is definitely more popular and its formats are naturally more widely spread.
Python is also a very bad language for many of the things it is used for (anything to do with numerics, e.g. machine learning) and having a competing format from a language which is, at least in that regard, far superior seems like a good thing.
Python is also a very bad language for many of the things it is used for (anything to do with numerics, e.g. machine learning) and having a competing format from a language which is, at least in that regard, far superior seems like a good thing.