What is Audyssey?
I think the HK has better zone 2 capabilities - separate remote control, ability to have a different zone 2 source without using an external amp. It also allows cross-over to be set for each channel, not just one setting for the entire system (as the Denon does).
OTOH, 2106 is XM-ready, if that's helpful for you. Also, I don't think the HK does any video signal conversion to component, if you're looking to use it as a video source consolidator.