I choose which language to use based on what the language is known for. Example: I'd choose C for heavy lifting tasks, because it's fast and (can be) efficient

I choose which language to use based on what the language is known for. Example: I'd choose C for heavy lifting tasks, because it's fast and (can be) efficient. But in a personal project, which I do in my free time, I'd choose Node.js. Just because I like JS.