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I do not think there would be any advantage to a PLLC over an LLC.
Some States require certain professionals (doctors, lawyers, accountants, etc) to register as a PLLC. The PLLC is intended for those that must have a license to engage in thier work.
I would elect the LLC, which has better liability protection.
I do not even think you would allowed to elect the PLLC, because your work does not require a licence (correct me if I am wrong).