Duralast is Autozone's house brand, they don't actually make anything. They get another manufacture (probably Standard or BWD) to put them in their boxes. I have a feeling Master pro is the same deal.

The only two manufactures I recognize are BWD and Delphi. Both are pretty good options with Delphi being a major OEM electronics brand making parts for Delco and Motorcraft. Quality wise, I would hand it to Delphi and BWD being my second choice.