easy enuf..... if you're looking more for SQ then go with the Q's..... if you're looking for a more SPL oriented sub then the BL is for you.... that's about the easiest way to break it down....
Man search, there are so many different threads about this. I was wondering what to get between the two also, and went with the BL. They get loud and sound decent doing it depending on the quality of the box. Also depends on how much power you have.