I got a DH Labs GlassMaster cable and it really is a big upgrade from the regular single core junk you find anywhere these days.
That said, I went ahead and ordered the 1300core cable from SysConcept.ca so I can compare the difference.
I did some research on this cable they use, and it’s actually manufactured in Japan by Asahi Kasei.
https://i-fiberoptics.com/multi-core-fiber-cable.php