I think this looks like the perfect way to compare rope abrasion resistances; simple and cheap, repeatable, and easily variable with different weights and drum radii and coverings. I think it is better than the Edelrid test I linked above, at least for our purposes:
Fishing line: Is Braid More Abrasion Resistant Than Mono? Find Out Here…
I guess the result could be explained by the high Denier a monofilament fishing line would have related forum comment. But perhaps its cyclic bend over sheave (CBOS) could be worse than braided?
Another way to test fabrics, or ropes:
What Is The Martindale Rub Test??? | With Elle at Eden Fabrics & Interiors - Upholstery Answers!
The Difference Between Wyzenbeek & Martindale Fabric Testing