What are advantages of AKC dog registry as compared to ACA or UABR?

We are considering a new puppy. The breeder suggests UABR. I'm only familiar with AKC.
Should I decide to show this sweet little girl in a few months, will the AKC accept UABR registration or will she be disqualified? Please give your opinion, with resources if you can, to help me make the best choice.
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