I personally would recommend Racket or Clojure. Both of them are much more opinionated and closer to Scheme than Lisp, which is a bit more loosey-goosey (i.e.,

I personally would recommend Racket or Clojure. Both of them are much more opinionated and closer to Scheme than Lisp, which is a bit more loosey-goosey (i.e., not focused on functional programming), so to speak. If you really want Lisp and not a Scheme-like, then Common Lisp is the only choice.