The one big pro/con item that sticks out to me is C2's lack of animations/transitions. That's always felt, to me, to be one of D3's core offerings.
Also, I'd be curious to know the sort of market share ClojureScript has in the web world.
People use it happily in production. In the end that's all that really matters.
https://github.com/clojure/clojurescript/wiki/Companies-Usin...
When the boss asks "Why clojurescript?" You can say, "You don't like it? Ok, sure, I will throw away these twenty lines of cljs and replace them with JavaScript - that will take two hundred lines of fail and a week of debugging..." The resulting look is priceless... Did you know that the pointy hair looks the same whether it is coming towards you or walking away :-/
A few hours to rewrite your brilliantly concise bit of code is sometimes warranted to keep my technology stack easier-to-maintain from a personnel standpoint.