In any of the 3 options, try to keep the connection as short as possible and away from the power amplifier power cord ...
In my tests coaxial was bit better than optical. Little bit more separation and sense of realness.
TOSLINK wiki:
Audio signal Digital audio bitstream. Originally limited to 48 kHz at 20 bits. Extended to support all modern formats (Depending on manufacture and specification)
Bitrate Originally 3.1 Mbit/s; now 125 Mbit/s
Don't have that hardware here, but, there you go.
Toshiba Data Sheet:
https://toshiba.semicon-storage.com/us/product/opto/toslink/detail.TOTX1701A(F).html
This site should save you wheelbarrows full of money compared to the usual audiophool onesthanks folks . if/when i get a new dac and amp i'll go USB so i can get the best performance even if i can't tell the difference . to me the whole point of upgrading is to get the best performance i can afford . the JDS atom for a C note looks to have WAY BETTER specs/performance than i could have hoped for . i got more patience than money but i can afford a c not or so every 2-3 months and probally not become single again , hahaha
but i get the feeling this forum is gonna cost me more $ than i was planning on and probably a few uncomfortable conversations with my better half !
Some of the newer torx for digital audio now reach 15 Mbps since about 2008. The 125 rated stuff is mostly duplex smi connecters.
i'm 57 and not a golden eared audiophile so for normal eared mortals is there much if any difference or reason to choose one over the others IF the hardware supports them ?