I've heard neither, but I listened to Paradigms for years in college, my roommate had them, and I own a pair of BX5s. I have to say that the cheaper Paradigm speakers, especially those I have auditioned, are too bloated in the bass, and the mids are not great either. Both brands have reps for a lot of bass, but Monitor Audio gives you better bass definition and better overall refinement at the lower price points, IMHO and YMMV. Once you get into the Paradigm Studio 100s, which I have heard, Paradigm's sound gets a lot better.
