First, the Node is a Bluesound product; the C368 is a NAD one. Same parent company, but there will be differences. At a glance, it appears that the C368 is more like a C 658 (streamer/DAC/preamp) with an amplifier added, and it uses a different DAC chip than the Node.
If you want to use a Node, then if you already have a DAC or buy a good but reasonably priced one, you can run the digital output of the Node into that. Amir notes that the digital output of the Node is just fine; his complaints are about the DAC section. Doing this gives you the BluOS functionality with better measured performance.
Amir did not like the C658 either, but (a) the unit that he had may have been broken, (b) a firmware update may have fixed the main issue that he saw, and (c) a number of others on the forum (myself included) liked the performance of that unit. Although the SINAD was nothing special, it's unclear how audible any issues there would be -- obviously those of us happy with the 658 weren't complaining.
FWIW, I previously had a C658, which I really liked; I moved to another setup for reasons unrelated to the performance of the 658. I now have a Node running to an external DAC, and like that setup very much -- the Node, like any decent streamer, has excellent digital output, and the BluOS software is intuitive, supports 20-some streaming services natively, and never lets me down.