Streaming: WiFi or wired??

The wi-fi dongle on my Cambridge CXN V2 streamer caused intermittent noise with my Bel Canto REF500M class D amps, problem was resolved by going wired (which to be fair was "wired" with CAT 6 from a nearby wireless router, just to remove the requirement for the wi-fi dongle). If you do go wired, my understanding is that CAT 6 cable (like what Tuneful Cables makes with AudioQuest stock) is made to higher standards for crosstalk than generic CAT 5.

@classdstreamer what aftermarket "low noise power supply" would you recommend? I have an Orbi mesh setup with wall wart power supplies.

ALWAYS is a strong word

applied to wifi vs ethernet - it is also incorrect

it depends on the situation, quality of feed into and out of the network, etc etc

Most equipment manufacturers will advise to use a wired connection if the device can do both and you have a choice between the two. Everything being equal, the best a wireless connection can do is be as good as the wired connection. It will not be better. If that’s the case, the wireless is definitely more convenient. Keep in mind that the wired connection will always be more robust.

In my experience, wired has always sounded better, except for one product, the Auralic Aries Mini. There is however a fundamental flaw with wired Ethernet, it acts like a long aerial that, in addition to passing your data, picks up RFI/EMI from your local environment.
In my opinion a good RFI filter is essential. The ENO by Network Acoustics is cheap and transforms the listening experience. Link to their site here https://networkacoustics.com/

+1 for Mesh wireless router/node