Node.js or Erlang

Question

I really like these tools when it comes to the concurrency level it can handle.

Erlang/OTP looks like much more stable solution but requires much more learning and a lot

Answer 1

I will Prefer Erlang over Node. If you want concurrency, Node can be substituted by Erlang or Golang because of their light weight processes.

Erlang is not easy to learn so requires a lot of effort but its community is active so can get help from that, this is only the reason why people prefer Node .