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Try the 60 day free trial of roon. If it sounds better, you have an answer! But more helpful than that obvious response, If it sounds similar, I'd still go with Roon. It's the best music management software I have ever used. I have the main copy of roon on a dedicated for music mac mini, and controller apps for roon on my phone and laptop. I find it simply awesome from a user experience.
Depends mostly on jitter. If you are using a USB interface or S/PDIF now and go to an integrated Ethernet interface, the jitter may be lower. It is on my products. With Ethernet though, you must ground the DC common on your router if you go wired.
If you are still using USB, then all bets are off. The software typically is too involved with volume control DSP etc..