I have had excellent results sending the BS Node to an external DAC. Having separates has also allowed me to try different DAC's (e.g. the Denafrips Ares) and that has been fun. I had an Atoll but it was an integrated amp with no DAC. They make good amplifiers for sure but I don't know about the quality of their streamers and DAC's.
Upgrade Internal DAC of Node or go with Atoll ST120.
Looking at upgrading to a external DAC for my Bluesound Node or picking up a all in one streamer/dac like the Atoll MS120 or ST200 or another brand all together. My price for all in one would be around $1500 and DAC only would be $1000. I stream via Qobuz. Big question would be what option between these two would sound best.