It is a good question and one that understandably can be confusing. The first thing to do is decide on what factors are most important to you. Think about how the system will be used. Will it be a system primarily used for music listening or will it be used mostly as part of a movie watching experience? Or, will it have to do double duty? How important is the invisibility of the speakers? Should they be completely invisible or a real statement or somewhere in between? Try and estimate the size of the listening areas and look to see where speakers potentially could be placed.