I find it interesting that, even after all this time, we still don’t have a great grasp on the various prequel-era hero props—what was screenused, what was photographed for reference (and licensed products like the Visual Dictionaries), etc.
I would presume that the screenused belt-hangers were mostly chromed resin (for the actors’ comfort), but then there are these mixed media/polished aluminum hilts which keep popping up. Were these built for hero close-ups, but not as belt-hangers? Built specifically for licensing and reference photos?
On the one hand, the prequel sabers were largely free of the restrictions which plagued the OT sabers—they could be designed and machined/cast from scratch, without having to scavenge real-world flashguns and the like as a cost-saving measure. Continuity and purist notions aside, the Anakin and Obi-Wan ROTS sabers are both gorgeous props, and represent the sort of slick, idealized, free-from-constraints design philosophy which the OT sabers might have had with the proper money and materials. That being said, the found-parts aesthetic of the OT is a huge part of its visual appeal. Nothing beats a Graflex!
On the other hand, because SO many prequel props were made from SO many materials, it becomes much harder to pin down which props were used when, as opposed to the limited number of OT hero and stunt sabers.