Sound is subjective so the salesman cannot say that one will sound better to you than the other. The Paradigm has a bigger cabinet and more drivers which will result in a more full-range sound and would work very well on its own without a sub (especially for music). B&W typically has a more detail and resolution (although the Monitor 11's are very good as well!!)and you may certainly prefer its sound over the paradigm, but for frequencies below, say 55-60hz, you will need a sub. Both are very good choices and I think would work out very well.