No I still use Jasper because I have old report templates that still work with it and it is simplier than redevelop.
It depends on your needs, the other tools you use, the workflows that already occur in your organization and your skills (r, python... mine is SQL)
I exposed our use case here : SQL first try to get Central data into internal PostGIS database - #5 by mathieubossaert
I do need to consolidate the data we gather with ODK in a larger database, which contains a lot of other data to "join" to.
I could manage to directly query Central's database, but logically, the "guaranteed" interface to Central is its API.
So I started to get data out from Central into our PostGIS database schemas through the API.
And now, as other users, I see and use ODK Central as a whole independent tool (even if it uses an internal PostgreSQL database) I query through its great API 