If you don't hear a difference then keep using the pc. I would not expect the Node to be better but it could be compared to some computers. Then there are a few purpose-built computers that is said to sound really, really great. Most streamers/servers are computers that are changed a bit to sound better.
Here are some more tips about building a pc server yourself with some comments about parts that affect the audio quality.
https://www.pursuitperfectsystem.com/building-the-ultimate-music-server---hardware.html
You can also buy software to optimize your pc for music playing. It might be unable to do other things after, if that is a concern.
https://www.highend-audiopc.com/audiophile-optimizer
Here are some more tips about building a pc server yourself with some comments about parts that affect the audio quality.
https://www.pursuitperfectsystem.com/building-the-ultimate-music-server---hardware.html
You can also buy software to optimize your pc for music playing. It might be unable to do other things after, if that is a concern.
https://www.highend-audiopc.com/audiophile-optimizer