I personally will only register with AKC.. AKC is the reputable registry, JMHO.. I believe that some breeders have been suspended with AKC and that is why they register there dogs with other registries.. I have even heard stories of someone buying a dog on limited AKC papers and turning around and registering the dog with another registry to breed it!
That is why I NEVER give the AKC puppy paperwork to the new owner until I have personally confirmed the dog has been altered!
Melanie