Streaming: WiFi or wired??

@snowbuffalo I used iFi power supplies on my modem and router. I recommend them. If you do try a low noise PS for you modem/router, I'm Interested to hear whether they make a difference for you. 

Two comments.

First, @guy-incognito, regarding how much sense it makes to install better cable than your ISP service speed needs, keep in mind that upgrades do happen. I recently went from 100Mb internet to gigabit and had to replace two runs of old Cat-5 (not Cat-5e) cable in order to get the new speed at my desktop. If I hadn’t been quite as cheap with the cable back when I got 12 Mb DSL, I could have saved myself some work this time around.

(Of course, I started at 300 baud in roughly 1980, so that’s been quite a change in connection speed over the years.)

Second, @snowbuffalo, crosstalk in ethernet cables has nothing to do with crosstalk in stereo separation. Ethernet cables have 4 pairs of cable inside them and they are talking about the interference between those pairs (crosstalk). There is no stereo separation in a digital signal until it is decoded in the DAC. Only then can you have a stereo separation problem. Cat-5e cable can do gigabit speeds without problem, though Cat-6 might be better for long runs or a particularly noisy EMF environment.

Agree with many of the above who point to implementation. I also believe there is no absolute and x is "always" better.

Nice little video on the subject matter (and the Aries G1 streamer by Auralic) by a reputable reviewer:https://www.youtube.com/watch?v=Cqd8UXCGU0s

Mahler123 is right.

Both wired & wireless will work excellent as long as they are working within their limits. The chances of wireless dropping packets and causing re transmissions are a bit higher than wired, especially if a lot of wifi devices are sharing the same band. Moving to the 11ac at 5G bandwidth may reduce those issues, unless you live near an airport or anywhere where radar signals are present.  This may cause the AP to change bands continuously (DFS).  Also, with higher frequencies (at 5G) , your signal degrades quicker so distance becomes more of an issue.  This is laws of physics and you just have to live with it.

99.999 % of the time, both will be fine :-) It is really a choice of convenience.

In this thread, I have read some references being made to "noise" in the PSUs and/or wifi signals. This is completely irrelevant.  The wifi signals (and hence the audio signals in the data packets) are carried in a digitized way and the PSU noise of the wifi and/or wired AP has ABSOLUTELY NOTHING to do with the quality of the analog signal you will achieve after it has passed thru your DAC.   Any AP noise issues will be automatically taken care of by re transmissions and CRC checks and error correction algorithms.