I don't care so much about token efficiency and cost, within reason. I care about whether the quality of the code is maintainable over time and through many iterations. My gut feeling is that very strict languages with good types, a standardized style, and very strong static analysis tools, is what helps make that happen. Of course it also has to be well-represented in the training data.

That leaves Go, Rust, Python with type annotations, and Typescript. And, I choose them in roughly that order unless there's a reason to choose otherwise. Rapid iterations on scripty tasks get Python. Most CLI, system services, and web apps are Go. Desktop apps and games are Rust. Typescript if I don't have a choice (i.e. it runs in a browser).