Which DAC is better ?

@big_greg. Good point. I’ll ask about it. Thank you 

Don't be surprised if the dac in the 8805 sounds better, it would be my choice, just use Heos for your streaming and it may just be all you need. Connect both as it will be the only way to know in your setup.

As you have a new system, use both DACs you have, identify what seems best to you. Get to know your system prior to the purchase of a external (3rd) DAC. Best to know what you are looking to gain with additional purchase.

@mesch i will definitely try both out first. Thanks. 

Try both, but I had an eye-opening experience with a Marantz outboard/stand alone DAC and headphone amp (with a Node 2i) and I strongly preferred the Marantz sound. Better highs and separation/spatial cues.

If the "voicing" is similar, there’s certainly a chance you like the onboard DAC in the Marantz better...