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@Dylan
tiny bit less resistance and friction cos ceramic bearings are can be made rounder.
They are also harder which should make them more durable.
Using ceramic bearings in a non-cartridge bearing setup, that would mean the bearing race is softer than the ceramic bearings and as such the bearing race would deform before the bearings would = new hub time.
In hubs where chrome/stainless bearings are used, the bearings are the softer party and usually deform 1st and are replaceable = No new hub time.
this is why i would only use ceramic if they were cartridge.
I just worked out that logically not scientifically based on any research.. take with a pinch of salt.