The below post is a response from Nicolas Dorier to post #7! As it keeps being updated.
Keep in mind Nicolas has developed a near complete rewrite of Bitcoin core, authored a book on Bitcoin development and also made minor contributions to very important Bitcoin improvement proposals, such as segwit.
Nicolas Dorier:
I think that people bashing C# does not know what they are talking about.
Java is very much retarded language, with lots of over engineered libraries and not as portable as C#.
Also, the user base of C# is comparable to Java. (
http://stackoverflow.com/tags)
No even mentioning Unity which is the most popular gaming dev plateform.
Take a look at my book about NBitcoin on
http://n.bitcoin.ninja/ and enjoy cross plateform bitcoin development without headache
Java is not as portable as C#? HAHAHAHAHAAHAHHA... you have got to be fucking kidding me. The JVM runs on almost anything. The only problem with Java is that it tries not to break backward compatibility(unlike C#) and it cannot evolve as fast as C#. And btw Java is far more widely used than C#