Indie - what matters is that you learn from the experience on the forum and then use that experience with your own judgement in finding the right breeder.
This breeder might be OK - but showing such a very young puppy to strangers is not the norm and does beg the question as to why. Just how old are the puppies? He looks to only be about a week old, if that. You need to satisfy yourself that this is a reputable breeder.
Socialising puppies is vitally important as mentioned above - but this can be and is normally done with family members and people the mum is comfortable with, not strangers. They are better raised in the home and exposed to normal daily family life, but while still blind and very tiny is risky from a disease perspective and of upsetting mum.
As for choosing a puppy - there's no way you can choose a puppy at that age anyway as you have no idea what they will turn out like. Also a sad fact is that the puppies are still very vulnerable at that age and while not common it is not unkown for them to suddenly fade and be lost.
From four and even better about 6 weeks is a better age when some of their personaity is starting to show. Colour is a secondary concern taken over heath and temperament.
Good luck - let us know how you get on. Try not to let the heart rule.
