I’m not entirely sure what you mean by your question loser, KC Registration makes no difference to anything concerning the puppy’s health or anything.
It is simply a written record documenting who the pups parents, grandparents etc are.
It means you can participate in shows if that is something you would like to do and it means that if you breed your puppy you can register the pups with the kennel club as long as your dog wasn’t sold with an endorsement on its pedigree.
That’s it.
It doesn’t make the puppy any ‘better’ than anyone else’s and it is absolutely no guarantee of a good breeder.
As stated earlier, most puppy farm pups are KC registered.
Forget about KC registration and focus on everything else about the breeder like the surroundings, the condition of the mum, health and number of pups, how keen the breeder is to question you etc.
There are good, valid reasons why a breeder would choose not to register but ultimately the number of bad breeders far outweigh good ones, regardless of KC registration.
If the breeder appears good in all other ways and you feel happy with him/her then get the puppy regardless of KC registration.