Yorkshire Terriers are not beginner dogs. They have a hunting instinct and are very independent and self-confident. They need a very consistent upbringing.
Unlike the Chihuahua, their grooming is also quite demanding. They need to be trimmed regularly and many owners prefer visits to the groomer.
The genuine hunting dog is 19-23 cm tall and weighs around 3.2 kg.
Please do not decide based on appearance alone, but familiarize yourself with the requirements, special features, and character of the respective breed. Are there any special problems (sensitive stomach, hunting instinct, behavior) or diseases within the breed? Which breed suits you and your lifestyle better?