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Clojure seems like the best choice if you want to use lisp in a professional context but is a bit of a double edged sword if learning lisp for exploratory purposes. When things go wrong with Clojure you get back confusing stack traces from the JVM and you have to work through 2 separate paradigms to figure them out. Common Lisp on the other hand has a baked in live interactive environment that lets you work through errors as they come up. This is such a unique (and productive) way to work that it’s addictive. That said Clojure’s api is just way more intuitive, probably due to when it was created.