UL多重列名、多重认可和多重分级服务的优缺点分别是？

All those you mentioned is the UL multiple listing/recognized/classified procedure, and I'd like to say here, there is nothing related with the advantages or disadvantages, just when you apply for this kind of UL procedure, then both of  you and/or your ODM manufacturer must have its own UL FUS procedure(even one of those two UL files is created just for multiple procedure), and furthermore, there will be a cross-reference relationship between your own factory and your ODM/OEM supplier, as well, the information of your own company and/or your ODM/OEM factory could be indicated on the final products.

Hopefully, it does clarify!