I am using it myself on a branch I haven't pushed to production. I would say DRF has better documentation and more packages that extend its behavior (like exporting to Excel). Ninja is a lot cleaner though, it works better with type checkers, and if you are also using FastAPI there is basically no learning curve.
Django Ninja has always looked beautiful. I've been toying with it since it was first announced, never pushed it to production tho. I've been thinking of spinning up a cluster just to dark launch it with calls from my main app to see how it performs.
