You did not give me a link to something saying that C# is faster (it is still not). Choosing C# only is only good if vendor lockdown is something you like (or benefit from).
I have been involved in a project where C#-developers where involved (MS lockdown). The funders asked me if i could take care of the project (rewrite it in java). C# is complete garbage.
I am as much of a Java fanboy as it gets, but football team level love-hate of languages is stupid. Also, this benchmark is not necessarily applicable to reL world programs.
The CLR provides some access to low level primitives, while the JVM rather hides them. The first choice allows for more optimization by the developer, but that will be explicit and will potentially disallow some automatic ones.
Java on the other hand hides most of these details and depends on a very advanced JIT compiler for most optimizations (like escape analysis), in which way even a decade old program will get magically faster. Of course it is only a crude difference between them, with Java getting primitive types, and CLR continuously improving in JIT and GC.
