But for denon It requires dirac to be purchased right ?If you are movie freak then Denon works better , for Music Yamaha is better. In general Denon sound signature is better than other AVRS. Denon provides better features / options to tune the sound. You get frequent firmware upgrades .. easily for denon which improves overall listening experience.
Just do audition of both AVRS from your end and decide which sounds best to your ears. Denon may be slightly expensive than Yamaha , but its worth spending on it.
build quality and long-term reliability are areas where Yamaha often has the edge-many users report fewer long-term issues compared to Denon