There are several differences between adult artist brushes and kids artist brushes, including:

1. Size: Adult artist brushes are typically larger than children’s brushes. This is because adults generally have more control over their movements and can handle larger brushes, while kids may find it difficult to manipulate large brushes.
2. Shape: Adult artist brushes come in a variety of shapes, including round, flat, and filbert. Kids’ brushes, on the other hand, will often have a more simplistic shape, such as a flat brush.
3. Bristles: Adult artist brushes  often have higher quality bristles than kids’ brushes.

   This is because adult artists need brushes that can pick up and apply paint more precisely, while Children’s brushes often appear in more general painting activities.

4. Handle: Adult brushes generally have longer handles than kids’ brushes. This is because adult artists often work at an easel or table and need the extra length to reach their canvas. Kids, on the other hand, can usually work closer to their painting surface.
5. Price: Adult artist brushes are often more expensive than brushes for children. This is because they have higher quality materials and are designed specifically for the needs of professional artists. Kids’ brushes, on the other hand, are often more affordable and are designed to be more durable for the rough handling they may receive.

   In a word, I think we should choose brushes according to age, demand, ability and other factors.