I think you should add to this comment "in my opinion."

Because in my opinion C# is miles ahead of Erlang. If I want to create an application, back-end, front-end, running on a wide variety of platforms, Mac, Linux, PC, IOS, etc, I would use C# 1000 times over versus Erlang.

The tools available, documentation, huge amount of libraries and support mean that developer efficiency in C# land is light-years ahead of Erlang. I could make a website + backend + IOS/Android app with all shared code while using tons of pre-existing OSS frameworks / packages and get it all up and running and prod/enterprise ready in no time at all and have it ready for enterprise load and scalability. Try that with Erlang!