I have never heard anything against turtleneck rawhide strings, only good stuff. Have also heard great things about woodchuck hides, too. I got a couple of them living down the canyon from me, but have not had the heart to hurt one cuz they are kinda cute. I was going to try jackrabbit hides but by the time I got them fleshed, all I had were tiny scraps and a lot of hair everywhere.
B50 gets my vote until I get these three antelope hides scraped down, then I am gonna try goat strings. Fast Goat = Fast String?