It just seems that Google, Twitter, Facebook or many other big Data companies will have some / many pieces of tech dependent on JVM. But I never heard anyone them using .Net
Big data isn't even analogous to enterprise. I don't even think if Google, Twitter and Facebook should be considered to be classically enterprise. However, what you say about big data is certainly true - that's not something .Net is competent at: keep in mind that doesn't make it wholly incompetent. The corollary is true: .Net does things some things really well that Java is dreadful at (e.g. last time I played with Java the UI situation was a complete joke).
That doesn't make either language/runtime bad or better than the other. Their strengths aren't static, either. They are merely different tools suited for different tasks. Both have some extremely large names using them.
That doesn't make either language/runtime bad or better than the other. Their strengths aren't static, either. They are merely different tools suited for different tasks. Both have some extremely large names using them.