This is quite simple, collars are for walking and working with your dogs, harnesses are for pulling and for sled dogs. There is nothing wrong with a collar. The only possible thing wrong with a collar is the person who didn't train their dog to walk nicely with one. Get your self a nice good collar and spend the time to teach your dog to walk on leash without pulling and teach him to respect it. It is some sort of a modern invention to have a harness instead but it won't get you very far. Plus if you really want to be cool then you won't have neither and your dog will heel beside you off leash. Collars will give you more control and can deliver correction if necessary.
