Scala and Clojure are built for two different purposes, both were made with different goals and problems in mind. This type of comparison is the same as comparing two different shop tools. On one hand you have a scrollsaw and on the other you have a tabletop saw. They are for two different purposes, and you won't find many people comparing the two. Programmers need to learn this, use a language for what its good with.
Language designers should also keep it in mind when describing their language. "I made this language with these problems in mind, and these goals in mind".