Rope halters also can give a more direct impact on the horses face whilst a nylon head collar whill soften this impact as it covers more surface area and often has padding or sheepskin on the lining.
I find nylon halters more sturdy than rope halters. Some horses don't like rope halters
I think nylon haters are much better than rope ones
Rope halters have the knots that give pressure on different parts of the face but nylon is flat
Rope Halter's give you more control but they will not break and can be very dangerous on spooky horses
Nylon Halter's you get less control but are safer and tend to stay put on the horses face better plus they are more colorful