I'm not sure about all the exact construction techniques between the different manufacturers, but all engine bearings consist of a steel backing with some sort of overlay material (usually a copper/lead alloy) in different layers. There's not much difference in the basic construction, just different alloys, etc. I have seen more engines built with Clevite 77 than Fed. Mogul, but that doesn't necessarily mean they're better. Maybe somebody else can shed some more light on the advantages/disadvantages of different types.
Will