In my personal opinion, C# is a superior language these days now that most of .NET has been ported into dotnet core. However, that's only been the case for a few years and before that, Java was in a league of its own with its excellent library ecosystem and omnipresent JVMs.

Java is a very boring language. Features get added slowly compared to other languages, improvements are generally quite gradual and new concepts only rarely ever get added to the language. This will drive away many hot startups and fresh CS graduates because they want to use the latest technologies in brave new ways and explore the ecosystem.

For general businesses, boring is good. Boring is predictable, understandable and maintainable. Java is not the fastest language to write software in, but it's fast enough not to warrant teaching your staff a new language for. It's missing many features that are standard in other languages, but there's third party libraries to make up for that.

In my mind, languages like Rust and Zig are the Teslas of the software world, exciting, new, full of flaws that need to be ironed out but ready to storm the general market one day soon. Go and Kotlin are the shiny new SUVs, impressive and high quality, but packed with weird design choices and opinions on how to use them. Java and C# are the old van the company has owned for 20 years. Nothing impressive, but reliable, comfortable, predictable, and with quirks that everyone has been learning for years now. Most businesses don't need a Cybertruck, they need to get around, and what businesses already have is good enough for the next while.