[zamalek]

It mostly depends on perspective. I work .Net enterprise and NEVER hear of Java - giving me the obvious false impression that it is Java that is unused. The only thing under the Sun that we really hear of is Oracle: that's one or two customers.

Both Java and .Net are viable, relevant and widespread technologies. It all depends on which segment of the market you happen to be catering to.

[ksec]

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

[zamalek]

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.