If you're using the Marantz for two channel listening, it's probably not going to make a big difference. That's not exactly an audiophile pre-amp. However, as others have said, try it and see.
Most two channel enthusiasts would not use a home theater processor for two critical two channel listening, so it's highly unlikely you'll find anyone that has tried both. I had a couple of Node 2 units for a while, and have a Marantz AV7704, but the thought never occurred to me to compare the DAC in the Marantz to the DAC in the Node 2 or to any of my other DACs.
I'm not trying to put down your system. I used a home theater system for listening to music for many years, but reached a point where I realized that I needed to move beyond that to achieve better sound quality. It sounds like you are headed in that direction. Consider getting a two channel preamp with a home theater bypass function if you're looking for a way to get the best sound out of your system.