Digital Cables: Optical, Coax, BNC, or a simple RCA interconnect?


Until recently I've been using a WireWorld Optical cable (~$100) which I bought when I was using a Pioneer PD 65 CD player as a transport (until it died) and optical was the only out option. So, I've been using my Oppo 105 to play both SACDs direct via XLRs to my Audio Alchemy DDP-1 dac/pre and recently using the optical cable for redbook playback.

Last week I was reading up on Coax, and one thread suggested trying a regular RCA interconnect, although the connectors are not 75ohms. I had a pair of DHLabs BL-1 (older light blue jacket) laying around and decided to compare it to the optical. Easy Peasy as the DDP-1 has various input connections which can be accessed on the remote. Well, amazing doesn't come close to how much the music became alive/tactile/3D.
So, I looked on DHLabs site after reading that their D-750 was highly regarded. They will let me return it if Im not satisfied. That's the good news, but a 1.0m cable is $150, certainly not expensive, but Pangea makes one that seems extremely well thought out and it's on sale at Audio Advisor for $49.95 plus free shipping, so I ordered it. Depending on how much it blows me away I may go ahead and order the DHLabs too, just to compare
Anybody have anything to contribute?
tweak1
I installed the Pangea 1.0M late yesterday. Some of the improvements were immediate; much better separation of singers/instruments, deeper sound stage, better bass impact. Over several hours this improved as well as timber and tone, and  location of instruments and backup singers on a much more believable stage.


CSN, which I have owned for 3+ decades was a perfect example of how amazing this cable is. Each voice was considerably more distinct from each other, and easy to tell whether it was Crosby or Nash; Stills sang mostly harmony until the last cut. New Favorite is a much better recording with similar distinctions 


How much better can the multi-hundred dollar coax cables be? Best $49.95 I've spent, well maybe the Machina Dynamica NEW Dark Matter applied to the CD tray.  This is a must for CDs


I ordered the 1.5M yesterday (only $10 more). It takes 3 days to get here, so I will have a couple days playtime should there be more break in. Which begs the question, what is approximate hours needed before coax breaks in? 
To whomever mentioned 1.5m will sound better: THANK YOU!!!
Right out of the box it is solidly grounded: the music is more organic without losing the timber and tone of the 1.0m. It definitely plays bigger, more robust

Now, this begs the question; has anyone compared the WireWorld Series 7/8 coax (1.5m MSRP $300), or the DHLabs 1.5m is $200. Hrrd to imagine they could be 3-5xs better than the Pangea
This was posted by Ricevs in another thread. I have long used Machina Dynamic Springs, but these look like a possible upgrade. Can't wait to find out!

https://www.smalley.com/wave-springs?creative=270098678569&keyword=springs&matchtype=e&n...
The 1.5 performed much better, but how many hours of break-in before it really comes on song? Last night was day 6 of connection, but maybe 10 hours of actual play time. I listened to Lyle Lovett and his Large Band, followed by Bonnie Raitt, Nick of Time (I have owned them both for ~10 years): they both sounded quantum levels better than they ever did, no matter whether I had an all tube system, or all SS with class AB amps.

Cutting to the chase, ones digital connection could be why some have negative comments about class D

OMG I see they also have a Premier XL $149 for 1.5m, so I’m ordering it now
https://www.audioadvisor.com/prodinfo.asp?number=PGDCPXL&variation=1.5