What I ultimately care about in a language is productivity and joy (but there's a strong correlation between them, so let's simplify to just one criterion, productivity)

I feel most productive in Swift and Julia (more so than in Common Lisp or Clojure) and some kind of a mix of those would be my ideal language.

One of the keys to productivity is how much mental effort does it take to understand the code doing some thing (for example arithmetic expressions in Lisp).