Perhaps you might want to have two sets, one to keep indoors and one for outdoors; it will depend on where your puppy will spend most of its time.
Bowls made of plastic can be easily chewed or scratched by your dog unlike the stainless ones, which are also easy to clean and sterilize.
It is important to buy hard, resistant bowls as puppies like to chew everything, and you would not appreciate your dog damaging its bowls all the time (for its own safety and your wallet).