Have you gone and listened to them both or do you have the opportunity to listen and see if you can hear a difference? If you can go listen, I would recommend that. I've done that before with some audio equipment where the specs didn't show a large difference. Then I listened...and bought the one that sounded better to my ear based on music or sound I would listen to. It won't be easy to gauge how it sounds in your specific room, but it is a starting point.
I would tend to agree with Ares and go with the 52's. They have the larger drivers for the lower frequencies. While not always the best answer, it lends me towards the 52's.