Well i don't no why brands of 100% HMPE would make a difference.
For the same reason brands make a difference with anything else. Some companies are well established with a great reputation for quality, and some companies offer cheap knock-offs. DSM is a company known for it's quality. They are so proud of their reputation that they require the companies that use their fibers to state it on the label.
but with D97 vs Rhino string made by Brownell there is a serious difference in the tone. D97 has a much higher pitch to it than Rhino does.... I wonder Why that is?
Tons of variables to consider, one of which is personal opinion. Can't argue with opinion, and without formal testing with calibrated equipment that's going to be all we have.
I've had lots of people over the years tell me that Dynaflight '97 was super quiet on their bows. I've heard complaints about every material, including rhino. Opinion.
Dynaflight '97 has been very quiet on my bows. Some of the variables are tuning, bow design, release...more than I care to think about. A controlled test using calibrated equipment and eliminating as many variables as possible--even using white in both for testing--would be the only way to determine which, if either, was quieter; if there was a notable difference, etc.
both strings with a 12 strand construction built by the same string builder and the rhino stays put, and is much quieter, & the D97 is still creeping well after its been shot in...... Why is that LBR?
I'm no psychic, so there's no way I could say with any certainty. Again, pointless to try to argue with opinion, and without any controlled tests and other specifics that's all we have.
One thing I do know is all HMPE string materials have a degree of creep to them. Even the highest grade on the market, SK90 by DSM, will have a degree of stretch/creep under the right conditions. That's what led to the development of materials like 450+, 452X, BCY-X, etc. Blended with Vectran, they are more stable, especially in higher temperatures.
I've heard of all sorts of things about strings over the years...that Dacron doesn't stretch; that this or that is tons faster, or quieter, or just "better"; that a Flemish string caused a bow's limbs to twist; that a string made a bow draw 4# heavier; that Flemish strings were less accurate and could even be dangerous...the list could go on.
With at least some I don't doubt the sincerity, but that doesn't make the claim any less of a mistake.