Yes, Optium products are more scratch-resistant than ordinary acrylic sheeting used as glazing. In any case, it's still acrylic and it can still be scratched or abraded, but it will easily withstand normal handling and proper cleaning.
Optium Acrylic and Museum Optium Acrylic both have the same Tru Vue optical coatings as AR Glass and Museum Glass. In order to receive the coatings properly, the acrylic has to be treated for abrasion-resistance. That is, the base acrylic sheeting for Optium Acrylic is FF-3-AR Acrylite, and the base acrylic sheet for Museum Optium Acrylic is OP-3-AR Acrylite.
The durability of Optium is about the same as Museum Glass, since it has the same coating, and that would be scratched first.