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There are pros and cons to both. There are lots of dogs in shelters that need homes. These dogs can be great companions but they are less likely to be pure bred dogs. One perk of getting a puppy from a breeder is that you get to mold it into a mature adult. If you are committed to thoroughly training a dog, a puppy may be ideal. Never, ever buy a puppy from a puppy mill. A cardinal signs of a puppy mill is the breeder makes an excuse as to why the mother dog is not available to view. This is because in reality the mother dogs is probably hundreds of miles away, waiting to be bred to produce yet more puppies. In the meantime her litter are taken away far too young and transported large distances to places for sale. This trade is unethical and immoral, and should not be encouraged by buying these puppies and creating a demand. A good breeder will make sure to socialize his or her dogs in order to guarantee they grow into confident well-adjusted adult dogs. This is especially important for the Doberman, who can be prone to anxiety or territorial behavior. Proper socialization as a puppy helps make the youngster accepting of strangers, rather than suspicious of them. This makes it less anxious and therefore better adjusted to life with people. The breeder should make efforts for as many different people as possible to meet the puppies from around 3 - 4 weeks of age, so the young dogs are used to people of different heights, appearances, and tones of voice. The puppies should not be exclusively reared in a kennel as this isolates them from the normal sights, sounds, and activities of a domestic house, and they will find it more difficult to adjust to family life. The Doberman is prone to a number of genetic health problems, some of which the parents can be tested for and some not. For example, Dobermans are prone to hip dysplasia and Von Willebrand's disease. Responsible breeders will screen the parent dogs for hip dysplasia and have certification to show what their score is (the lower the better.)  A low hip score is no guarantee the puppies won't have poor hip anatomy, but it reduces the risk of this happening. There is also a blood test for Von Willebrand's disease, so ideally it would be good to know the parents are negative.
Decide between adopting an adult dog from a shelter or buying a puppy from a breeder. Choose your breeder carefully. Be aware how important socialization is. Check the family history of a dog you are considering adopting.