So, basically, both are fine but it depends on what you need (as with most tools).

In my opinion a less verbose language is better, also, python have tons of packages installable via pip, is C++ extensible (for those scenarios where speed matters) and is present in most platforms.

Also, although there is an Open Source Java implementation, not all the “core” libraries are, I mean, you can’t just replace Oracle’s Java with the Open Source and expect everything will run just fine, probably will, but slower. read more