Which DAC is better ?

This you need to hear for yourself. All it would take is switching inputs on 8805 once Bluesound is connected via digital coax and RCA IC’s.

My advise would be to seek a better outboard DAC, if you want to hear true potential of Node 2i and high resolution streaming from Tidal or Qobuz. If you are streaming from Spotify, don’t bother with external DAC as either of the internal DAC’s in Node and Marantz would do just fine.

If you’re interested in external DAC, read up on so many threads here discussing the recommendation on outboard DAC for Node 2i.

Thank you. I will try both ways and look into an external DAC. 

My guess would be the Node 2i is going to sound better, but you should listen and decide for yourself.  If it matters (it doesn't to me), I don't think the DAC in the 8805 will do the full MQA unfold like the Node 2i.