
Really depends on what you're most comfortable with. If you attend ringcraft classes, see what types of leads other people are using and ask if they would be willing to let you try them out. Even within my breeds, I tend to use different leads with different dogs. If you have a dog that really moves out in front of you, a longer lead would be better. However, if your dog doesn't move out as much, you might save yourself the hassle of dealing with a lot of extra lead by getting a shorter one. You also have to think about material preferences, as you can get nice leads in nylon, leather, etc.