I've only heard (and owned) the Energy. It's wonderful at its current sale price, a terrific performer with music. The Klipsch will play louder but some people say it's not so great with music.
I bet the Klipsch would be more thrilling with movies and the Energy more impressive with music. Just keep it in mind that the Energy doesn't have quite the same output as the Klipsch. They have about the same published frequency response.
Once again, I am sorry to take a sledgehammer to so small and fragile a nut. -- Richard Dawkins, The Greatest Show On Earth