[tunesmith]

> - Erlang (Actors): fibers are better. Use Clojure if you like Actors.

Usually the suggestion for actors is to use something else, but I think the main exception is the big one. If you have a need for horizontally scalable concurrent state and behavior, there hasn't really been a good alternative to distributed Akka Cluster Sharding. People are working on it, but I don't think we're there yet (although my opinion might be six months out of date, I haven't caught up).