[baystep]

Reliability of the language and tool sets is a big one. Availability of coders in the language is another, there's an over abundance of C++/Java coders looking for work, but finding a team of Rust developers is a bit trickier.

Also in general, I would start with a list of languages that are built-for, or can easily support, what your product is. For instance, I love Go but wouldn't use it for a GUI application.

And in honesty, managed languages are a bit better in my opinion for projects that will require many devs to work on it. As much as this statement might catch flack, C++ is wonderful and powerful and I trust my ability to use it; but do I trust the workforce to? It's very easy for a dev to write a patch fix that also manages to introduce a memory leak or null pointer and crash the whole thing.