Why does it matter whether my immigration petition qualifies me under O-1A or O-1B visa?

A: The reason this O visa immigration distinction is important is for a number of reasons, perhaps most importantly because the burden of proof that is placed on the Beneficiary of an O-1B petition, for someone involved n television and film productions is higher than the burden placed on O-1A applicants. Another difference is that O-1B applicants are required to get two advisory opinion letters to be submitted with their petition.