I have dCS Vivaldi and tried Nordost Odin AES/EBU cables but it sounded a bit too dim, changed to Audioquest Diamond but it was too bright, finally settled with Audioquest Wel Signature which has the right balance.
Recently I changed all clock cables to Nordost Valhalla BNC. The improvement was more than expected. You should use high quality digital cables for the clock, at least in the same league as the other digital cables if not better in order to get the best out of the clock.