I think they have different ecosystems where they shine. Java has a huge ecosystem for web services, big data and co. The amount of available frameworks and li

I think they have different ecosystems where they shine. Java has a huge ecosystem for web services, big data and co. The amount of available frameworks and libraries there is partly so large that you even don't know where to start and what to use. C# has a smaller amount of tools available for web. However in the industries where I worked (automotive, embedded, etc.) I always see C# based libraries and tools instead of Java ones. E.g. I've seen dozens of test frameworks for embedded systems written in C#, none yet in Java. Also libraries for specialized measurement equipment are often available for C#. I guess that's somehow because the EE industry is traditionally more MS focused than the pure software world, and Windows is still the default installation.