[Vinnie]

I think treats are great for pups, especially if they are food motivated. Luring them into the positions you want and marking it(clicker or a key word), then treating works very well for the young ones. I like to mix up the treats with a bit of tug to keep the pup engaged and don't spend more than 5 minutes training sessions for the little ones.
You can fade them out eventually.

And for me, this is the key sentence. IF they are food motivated.

Usually, treats work great for most puppies but occasionally you come across that one puppy who could care less about food/treats. I think if you find what motivates your puppy - that's what you should use.