Sound quality... size... price... appropriateness for application... there are lots of things. To me, your question is too general to answer. It would help to be more specific in what kind of project you are talking about. Is this for a home theater or a Frat house dance floor? How big is the room? What is the associated equipment? What are your goals and priorities? What is your budget? Where do you live (not all products are available everywhere).
We need to know much more if you want a good answer.