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If you're indifferent to Java then you can use a Lisp that just so happens to let you interop with Java libraries which is very very handy.

It's also a nice Lisp, tho not as pure or quite as powerful as others.

But I'm not very much up-to-date on anything new in the past few years, and I was never a guru anyways, so maybe there are better pitches.

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Do you have a favorite accessible guide to comparisons of lisps with respect to purity and power?

The main "unpure" parts of Clojure is that

* it doesn't do tail call optimisation unless you explicitly mark the self-call using by using recur (the lack of implicit TCO is a JVM limitation) * it doesn't use macros as much, although they are they're there and still used pretty often * it has language literals for the built-in data structures that look odd to other LISP'ers, e.g. {...} #{...} [...] * it's error messages are ecosystem dependent, e.g. Java stack traces for Clojure or and JS ones for ClojureScript

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