The texturing is of no importance. The point is friction which many multis especially after broke in have a lot of friction do to true texture.
IE x-one has a rough texture perpendicular to the string, you can feel it with your finger, same for NXT and further more over the outer core of NXT crackles at the string points leaving jaged edges, no other string has more texture than that.
Anything else is just plain moronic, you want some thing that will actually grab onto the felt of the ball, no pretend indents on some string.