dacron seems to have a twangier sound, ff more crispy. I think it depends on tension and string length too...
Someone brought a glass/wood laminate longbow (hill style?), 65#@28" to the range tonight. He has no string of the proper length, so I offered to make one. Think I'll go with a b55 fat string for safety.. I also have D97 though.. That bow looks like it could be pretty old. Rather narrow. The back is a greenish/cyanish color, looks a bit of a grid pattern. Maybe some of the laminations are bamboo. maybe i'll post it in the campfire