To be fair I own a fair few SPDIF cables as well, and no matter what DAC I use, NDAC, Hugo Original, DAVE etc I do hear a difference… often varying authority of sound… I suspect more to the plug cable combo than from than cable itself.
FWIW I find the DC1 a more deeply balanced sounding cable, where my Gotham AG connectors on the whole tend to sound airier and lighter… all subtle but definitely there.
I agree with David, I don’t hear a meaningful difference in sound with SPDIF connector adapters, although an adapter is less reliable in the long run.