I use D-97. Since I haven't used other low stretch materials, I can't really say how it compares in loudness, though some others have reported that it is louder than some other low stretch materials. Regardless, it is quiet enough for my use. I use two small wool puffs on the string, which quiets them sufficiently.
It's interesting that M60 mentioned Bear TDs. I have several, and the D-97 is very quiet on a couple of them; not as quiet on a couple of others, and I have no idea why. Same thing with some of my ASLs. Models from one builder are pretty quiet. A couple of bows from another builder are not. All with the same D-97 string material, number of strands, silencer position and material, etc.