NHRA metal line ?

I am not trying to be a problem here, just want some guidance. Russell twist lok is NHRA approved as well as many others in this list. http://www.nhraracer.com/Files/Tech/NHRAAcceptedProducts.pdf The NHRA rule book allows them except in areas that could be cut by flying debris from flywheel area etc. Any thoughts on non-metallic braided lines instead of metal. Just tell me to go all metal if that is best. Thanks