Im not really sure what the difference is between these two reg. I mean other than the obvious, all my dogs have always been AKC reg but is ACA as good?? I was looking at a pup that I found out was ACA reg, now if the sire is AKC and the dam is ACA reg how does that work for the pup?? Do you get a choice of what reg u want?? Or does it really matter? Im so coooonnnfffuuussseeedddd!!!