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The answer will probably depend from person to person. In the end choose whichever _you (and your team)_ feels more comfortable with.

Thanks for your answer!

erlang is more fun, and is was designed for what your discussing, but you'll want to learn both the language and OTP

And what do you think about the learning curve?

Depends, but I personally think its comparable to the learning curve of Java, in fact, I found it easier to learn about than Java. I would immediately recommend reading Joe Armstrong's thesis, which goes into the design process of the language and the OTP https://erlang.org/download/armstrong_thesis_2003.pdf

In fact, I would recommend reading that even if you didn't want to use Erlang, its just a good and interesting read, which offers some cool insights into concurrency, distributed systems, and message passing.

I will read the Armstrong's thesis! Thanks.

Use what you know.

Erlang or Java (Reactor)