Some trainers feel that rope halters give more control, as they are thinner and exert more pressure on the poll when a horse fights his confinement. Many trainers also use rope halters that have strategically-placed knots on the nose that pressure the sensitive area on the top of the horse’s face when he exerts power against the halter.
Web halters are the halter of choice for most individual horse owners whose horses are already well trained.
The materials and configurations are different. There are halters (usually cheaper) made from polypropylene webbing. These are usually the bottom of the quality ladder, single layer and prone to not last very long. Nylon is a better quality material. Some halters have chrome or brass eyelets that are stronger and will last longer than halters with just pressed eyelets. Top quality halters have double or even triple-layers with heavy-duty stitching. The extra money is usually worth it.
A rolled throat is more comfortable for your horse. A side snap allows you to put a halter on like a bridle. It is easier to get onto and off of your horse. Adjust it once. It fits every time.