Depending on the streamer’s or DAC’s WiFi and Ethernet isolation, it is generally better to use WiFi unless you can connect a switch from a long Ethernet line and then connect a very good quality Ethernet cable for the last meter or two. Having a decent switch connected to that line ensures timing and packet integrity, and a good quality Ethernet cable maintains it. The switch could be a decent Cisco one - it does not have to be an EtherRegen or fancy $1K+ switch / reclocker, though the ones I’ve tried do work very well, and I own the SR UEF Switch myself, from which I replaced the EtherRegen.
As for my setup, I actually use WiFi from my router to a Netgear Orbi satellite, then run a 1M DH Labs Reunion cable into the SR Ethernet Switch UEF. From there I run multiples of the same cable to each of my audio components that have an Ethernet input.