Depends on where you want the SPL. Sealed subs have lower usable output, but ported generally have more output in the 20-40 Hz range, which may be important to you. After having owned both, I personally prefer the natural roll-off I get with a sealed sub. It seems more.... I dunno, polite. I don't want to think about my speakers while watching a movie, and ported subs seem to call a little more attention to themselves somehow to me. Sealed sounds a bit tighter and quicker.