Welcome to the forum roofish. It's a good question you have asked, I have never given it any more thought than dependent upon the tyer certain lengths may be more comfortable. I don't know if Laurie reads any other posts or not, but if you went to one of his, he probably would be the best bet for an official answer.
“...You cannot help the poor by destroying the rich. You cannot lift the wage earner by pulling down the wage payer...” Abraham Lincoln