Ethernet or USB

I asked this question at the PC board of the Asylum, but didn't get a clearly responsive answer.  I can use Ethernet from a router via a Google MIST network to an Ayre QX-5 Twenty or USB from an iMac to an Ayre DX-5 DSD.  The sound quality of either with streamed (Qobuz and Tidal), downloaded, or ripped files using Roon seems excellent, although it's been awhile since I've used the USB connection.  Is there a reason to prefer one over the other?

I haven't been spinning discs recently, but a couple of days ago I played an XRDC of Bill Evans "Sunday at the Village Vanguard" using the DX-5 DSD and was struck by the detail, depth (the bar sounds were well behind the musicians), and bass that seemed superior to what I recall with the DSD64 file I downloaded from Acoustic Sounds.

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