Should I use the dac in my node2i or the one in a marantz av7705?

It can't be hard to try both out and see if you have a preference or can even tell a difference.  I have a Bluesound Node 2i and prefer to use a standalone DAC.

My uninformed opinion would be to go digital into the Marantz and eliminate an analog connection that's more likely to be susceptible to a disturbance in the force.

I would use the dac that sounds better.

I would use the dac that sounds better.

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PD Creative

Without this the streamer itself is the true bottleneck, not the internal or external DAC. I have them on the 2i and n130. Just incredible. They invoiced me with PayPal in US dollars. The sale price (370 PLN) is currently US $85.

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.