Fast flite has sort of become the generic reference to low-stretch strings. Been around a long time. D-97 is newer. That's what I currently use, but have read that some of the newer materials are better yet.
Yes, for me D-97 is a tad noisier, higher pitched actually, than dacron, but I have no trouble quieting it enough for me with wooly whispers. Low stretch strings get noticeable performance increases out of most bows and reduce hand shock at the end of the shot. Unlike dacron, they stay put once shot in, i.e., they don't stretch, at least not as much, with temperature changes, etc. And, they're more durable than dacron.
Dacron makes a good, quiet string. I just like D-97 a bit more.