I mean that's the main difference between the wire and all the others, really; the wire is round metal, the others are shapes stamped from flat metal.

That said, my current PC has plastic "angled slats" at the back (outlet) and a honeycomb and mesh (filter) at the front, so it could be quieter. I'll keep it in mind if I ever buy a new one. I believe the wire one was the most common on older PCs (90's / 2000's).