From personal experience....2-channel and multi-channel sound quality, imaging, musicality, sound-staging, dynamics, overall fit and finish, intuitive nature of the touch screen menu system and configuration options overall, levels of customer support and assistance I've received on several products, their reputation for excellent customer support, etc....I've also found their DSP pre-processing and post-processing for DD and DTS along with THX and THX Ultra2 post-processing to be of superior sound quality.