Which one would be your most favorite?
I know you can not choose only one because they are all for different things and sometimes you need a lot of languages for a project.
But if I had to choose my favorite: of course it would be C#.
The most elegant, easy to read and understand, and the most modern and developed Microsoft language to me also very compatible with the best IDE in the world which is Visual Studio. Also Microsoft is on the rise because of the new AI developments. So I am glad I chose C# as a language 12 years ago, that has been a really good investment. You can develop pretty everything these days with this language also: desktop, web, mobile, games, AI and ML apps, cloud and so on.