My feelings on this is always that the power supply matters more than the switch. The ability of wall warts to inject noise into the AC line should not be underestimated.
Where to place your best switch?
I have a cheap switch after my modem/router connected with cat 8 between them. From that switch I have a 35 foot run of cat 8 that fits into my Eno filter which is then connected to my streamer. (This cheap switch also has a PC, audio receiver, and my TV upstairs connected to it. I have read that audio is best to be separate?) I have purchased and on it's way a high quality LHY Switch that has an OCXO clock and linear power supply built in. MY two options would be:
1. Replace the cheap switch with this switch.
2. Place the better switch at the end of the 35 ft long cat 8 and use a short quality ethernet cable such as a WW Starlight 8 into the Eno Filter.
My suspicion is that #2 will be better but I was wondering if all these connections make a difference and detract from any gains. I have been reading a lot but many of these threads get into pissing matches and get off topic so it's hard to sift through them.
I realize I can just try both options myself. I am not going down the fiber optic route, I am happy with the 35 foot cat 8 connection. This is in my basement and the cable is run already.