Show me the visual Editor for GUI Applications on Mac and Linux. If there is none: no chance. If it is only GTK#: forget it because it looks that ugly that I can’t stand this as application look and feel. That’s behind all what Java delivers: with different Look and Feels (Like Darcula, IntelliLightFlat or others) you can build modern looking cross platform Apps. And if you want you can use natives, also working. That’s JaVa DeVeLoPiNg. Working since 1998. On ALL Platforms looking the same and on all platforms working without stresses. C# is another animal. Sometimes it works like expected, sometimes not. On Mac the Visual Studio is completely different to Windows and on Linux the programming totally different to Mac. So you’ll need really passion for developing and Testing. I don’t have that kind of passion.