I have UKC, ADBA, BFKC and they all are good and well respected but UKC only reg UKC dogs now u can not tranfer from ADBA etc. anymore thats for my Blues anyway ADBA and BFKC are my 2 of choice with BFKC being the best Mr Mims been doing his thing for a min now and they are true ,fast and not all about the $$$ and they give u the ROM and POR that I don't see on my ADBA papers they did in the past I remember seeing on other ADBA peds . But for shows ADBA but only thing is like others have said the judges will have there favs but good luck haha. But they take BFKC and some others top reg u can get it done at the shows for a fee . Or you can just dual reg my dog king was BFKC and ADBA so there are a few choices.