The truth is that it really doesn't matter that much.

Use the language that you like (enjoy your favorites!) and that binds well with other tools you're using. I'm currently working on a project that's all C++ (wxWidgets frontend, plus C++ backend). I've used LLM tools with it, no issues. Would be the same with any other language, from what I can tell. I have another project in Go I'll probably try it on at some point soon.