It's impossible to definitively say which breed is "smarter" because:
* Intelligence is complex: Dogs exhibit different kinds of intelligence (problem-solving, obedience, working, etc.). One breed might excel in one area while another excels in another.
* Individual variation: Like humans, individual dogs within a breed will vary in intelligence and ability.
Both breeds are highly trainable and excel at tasks like:
* Obedience: Both are eager to please and learn commands quickly.
* Agility: Their agility and athleticism make them good at agility courses.
* Herding: Both have strong herding instincts.
* Therapy work: Their intelligence and gentle nature make them good therapy dogs.
Ultimately, choosing the right breed for you depends on your lifestyle and needs.
Consider:
* Energy levels: Both breeds are energetic and need plenty of exercise and mental stimulation.
* Grooming: Both have thick coats that require regular brushing.
* Personality: Aussies can be more independent and stubborn, while Shelties tend to be more affectionate and eager to please.
It's best to research both breeds thoroughly and meet individual dogs to determine the best fit for you.