Just because its not the most powerful macro systen ever created does not mean that its not powerful, so the sentence is completly ok.
So it seams to clojure macro system is more powerful. That said that does not mean its better.
Also, Clojure macros are kind-of, a-little-bit hygienic, with their rules for identifiers resolution.
Anyway, I'd say they're rather similar in expressivity and capabilities, but I don't know both macro systems well enough to do detailed comparison.