Both of them are excellent speakers, but they couldn't be more different in terms of sound. I really urge you to listen to both before you make your decision. I tested both the Wilson WP7 and the Avalon Eidolon Vision before I made my purchase, and found that I prefer the Eidolon Vision, and therefore, bought them. Given the fact that you are already using the Wilson Duettes, you may have already developed your sound preference in a choice between the Sophia and the Indra. But you really owe it to yourself to try to listen to them before you make your decision!