But then it does matter. While choice of language is not the end all be all it will affect run time, scalability, resource usage, correctness and time to market

But then it does matter. While choice of language is not the end all be all it will affect run time, scalability, resource usage, correctness and time to market. And if you have a choice in language to use then do not forget we are humans with psychological considerations; balance the choice between the one you want while also considering its fit for the problem domain. Going less common has its down but also up sides. Its up to you to decide what is paramount. Some syntax and language features suit different mental types better. This will affect things like motivation hence touching correctness, time to market and similar mental state affectable things.