@climbereg - As a high level summary, my opinion is that all of the tinned copper Belden varieties displayed the rich midrange-centric "real sound" discussed by Jeff Day and Mr. Shirokazu Yazaki of SPEC Corporation in the Jeff Day blog here and here, with a 2024 follow-up here.
After listening to the different Belden cables several times, I seem to like the original 20awg 8402 cables best overall but the larger 18awg 8428 cables were close and I could certainly live with them, especially between my preamp and amplifiers. I did not get on with the 16awg 8408 at all. The 8408 cables I received were improperly constructed and I returned them but the poor construction was related to reliability/durability and not how they sounded, so I was able to listen to them and IMO the sound was a little thick and dull in comparison to the others. I was not particularly surprised as thicker is often better for speaker cables, but not for interconnects.
The Gotham 10561 GAC-2 UltraPro and 10601 GAC-2 AES/EBU were both clear and open sounding, and many would probably say they were more "accurate", compared to the tinned copper Belden's real sound, which tended to romanticize the midrange and fill out the bass. Of the two Gotham cables, I preferred the 20awg UltraPro over the 22awg GAC-2, which is intended to be used as either a 110 ohm digital cable or as an analog cable. I haven't tried it as a digital cable but maybe I will.