This shit has been beaten to death over the course of decades.
Scheme - reading SICP. Read SICP. There are, like, three guys in the world also use it for scripting and plugins. Lots of implementations, about three that matter.
Common Lisp - big, hairy, industrial, fugly. Bigger libraries, good performance, very flexible, and an eyesore.
Racket - Scheme with more features, actual libraries and bundled with a mock-IDE.
Clojure - functional programming fetishism, easy Java turkey interop, more libraries in both Clojure and Java than the others. Has UGLY AS FUCK stacktraces.