Posting, primarily, because my experience with digital v. analog cables is different than what @kalali posted:
My experience via a number of direct and lengthy cable comparisons points to far greater deltas within digital cables than with analog interconnect cables.
This post is not in disagreement with kalali's findings...in fact, it illustrates @almarg 's point vividly:
I’ve found that an average quality digital cable - optical or coax, performs better than an average quality RCA/analog cable.
My experience via a number of direct and lengthy cable comparisons points to far greater deltas within digital cables than with analog interconnect cables.
This post is not in disagreement with kalali's findings...in fact, it illustrates @almarg 's point vividly:
There are way too many variables and unknown characteristics of the designs that are involved to be able to provide a general purpose answer.