in creating mobile apps c# and java which is better

Question

c#

Answer 1

Java is a better programming language for creating mobile apps, since Java is the native language for android apps

Answer 2

The better is the one you dominate the better, since you can use either. Unless you're developing to iOS.
Plus, C# has native support for integration with other languages; that means you can make your main project in C# while making specific parts in any other languages and incorporate it in your project.