what is most similar to Java ... C# or C-obj?
also if you know Java/Android what is most easy to learn after iOS/C-obj or WinPhone/C#?
in the latter case, what other criteria should consider, for your choice?
Can I learn C-Obj, Swift, iOS, OS X development and after learn If I wanted to C/C++ or even C# ????
I have background in Java, Java/Android and Web languages...well?
Sorry, but "easy" varies from person to person. Just check out the numerous resources and try them out yourself.