I've used JRuby with some success in production fairly recently to bridge two codebases, one previously in MRI Ruby and another in Java. It honestly worked well, but I always wondered about TruffleRuby and how it would have played out if I had chosen that runtime instead. I may still give truffle a go, but it's on the back burner for now.

Anyone have personal experience with all both runtimes and which jvm interop works better? I kinda wish both had unified their interop APIs better, especially given they used to coexist in the same repo for a time...

I maintain a JRuby-based app. I looked into TruffleRuby a number of times but faced issues each time on that code base, so I could not get to the point where I was able to compare anything. YMMV!