Hmm. This seems like an odd comparison to me as Coffeescript and ClojureScript really have two different target audiences. Coffeescript seem to be more targeted towards people interested in writing JavaScript application with a more clean syntax whereas it seems ClojureScript's aim is to allow people who want to write Clojure, do so targeting a JavasScript VM rather than a JVM. I'd expect people looking to use either would probably know which one they were looking for from the get-go.
Interesting summary of ClojureScript's current weaknesses though.
I think the audiences are not as different than you think (I use both). CoffeeScript is for anyone wanting to write in a more expressive language.
ClojureScript offers that and even more without requiring people to fork ClojureScript. For example I got my pattern matching library working for ClojureScript - http://dosync.posterous.com/advanced-pattern-matching-for-ja.... match looks deceivingly simple, it's a fairly involved extensible optimizing pattern match compiler implemented as a macro.
EDIT: a fun example of how expressive pattern matching can be - here's a pattern for checking red black tree balance and the incredible output - https://gist.github.com/1177437
Interesting summary of ClojureScript's current weaknesses though.