dns zone replication in active directory

I have looked at the links below but I do not see clearly the benefits of changing dns zone replication in active directory, can anyone explain the benefits and why this would/ should be changed?

https://technet.microsoft.com/en-us/library/cc779655%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396

https://technet.microsoft.com/en-us/library/cc784148(v=ws.10).aspx