Paul
I think your correct when you say the general consensus is that coax is better. The reason is probably down to the digital conversion from electric to light and back again at source and amp.
My own preference is coax, which I use on my CD and streamer using optical as digital output from the Oppo (i use analogue for SACD) and of course the sky box as there is no alternative on that box.
SOURCE:OPPO UDP-205 BluRay, SkyQ, Technics SL1210M5G/HexMat Eclipse/MN Bearing/Origin Live Gravity One puck/Isonoes with Boots/Jelco TK-850S Tonearm/Hana Umami Blue, PS Audio Stellar Phonostage. I also have an AT-OC9XSH as a spare cartridge.
AMPLIFIER: Bryston BR-20 Pre/DAC/Streamer & Bryston 4B3 Power Amplifier
SPEAKERS: Spendor D7 on Iso-Acoustics Gaia III’s
HEADPHONES: OPPO PM-1 with Atlas Zeno cable, B&W Pi7 S2 and B&W C5 v2.
CABLES: Analogue: Speaker Atlas Mavros Grun. Interconnect - Atlas Mavros XLR x3, MCRU Silver Tonearm cable
Digital:Audioquest Carbon Ethernet x 4, Audioquest Carbon digital, English Electric 8Switch, Chord Optichord, Atlas Optical.
Mains: PS Audio Perfectwave AC-05 x 5, Isol-8 Powerline Extreme with Quantum Science yellow fuse on input cable, Sounds Fantastic 6way Mains Blocks.
STORAGE: Synology DS216J NAS with 2 x 3Tb WD Red hard-drives. Samsung 500Gb SSD.
TV LG55B7 OLED