Well, Jay, overall Denon has a higher rating than the Yamaha in the "Audiophile" crowd. Denon has always been a good entry level product line for the audio snobs. Not to say that Yamaha is not an excellent brand but according to those "professional ears," they don't sound quite as accurate to them. That being said, I don't know about you but I am not a professional symphony orchestra conductor and can't quite discern subtle differences as good as they can. As far as audiophile grade audio equipment I prefer Rotel over Denon but that is a different story.
Let your pocketbook be your guide, both receivers should perform satisfactorily for you...