I think the Durham boils down to shave angle, I haven’t used either of my Durham safety razor style razors but I’ve really enjoyed the double edge straight razor with guard...provided I lay it flat against face. I know the pathology blades are used for frozen sectioning and similar tasks, all of which are done in a fillet style approach with little to no angle. I tried to used the Duplex with the stropping attachment that is said to allow you to mimic traditional straight razors and I didn’t care for it.
‘The good news Dave, you can now send your very cool Durham razor to the bay with a few new blades and fetch top dollar. ...the go buy MORE STUFF!