I am curious as to which types of leash everyone uses. It seems that the vast majority of trainers reccomend use of leather leashes. I think that nylon leashes are more comfortable in the hand and a little more durable (weather, water, etc.). They are also stronger (leather = 2500-3500 lb tensile strength, nylon = 4000+ lb tensile strength). With this being said, why do more people reccomend leather?