Darko says:
Where EJ Sarmento’s design kicks goals is on sound quality when direct-connected to a DAC via USB, TOSLINK and especially coaxial and I2S.
So if you want I2S, I suppose that trumps everything.
The Innuos only has two outputs, usb and ethernet. Both highly optimised with their own low noise power supplies. I use the ethernet output and the quality seems superb. It also means it does not have to sit near the stereo. My Innuos is in my office on another floor of the house, with a direct connection to my streamer (fibre optic, converted to CAT6a at either end).
The W4S is quite a lot more expensive and I can find nothing about its power supply, which is one of the fundamental features of the Innuos. (Innuos Mini = optional external LPS, Zen = 2 internal LPS, Zenith = 3 internal LPS, Statement = 8 LPS in a separate box). The Innuos also has a high quality mains filter.
Generally, few people compare servers. Life is too short.