I think the B&W's would sound superior for music listening, and the Definitive Technology speakers will sound better for movies. Are you planning on getting matching center and rear speakers as well? What is your budget? If you were willing to buy used speakers, I am almost positive that you could get something much much better than either the b&W's or Def Techs. Keep you eyes open for a pair of Ascend Acoustics Sierra-1's. Those can often be had for $500 to $600 dollars and they will stomp on the other two speakers you are looking at.