Nickel PLATED brass
My experience: Nickel does clean up easier and look nicer. I've heard that it also doesn't corrode when worn in leather cartridge loops on a belt. However (there is always that darn "however!") nickel is not a ductile ("bendy") as brass, so the cases tend to split at the mouth earlier in their reloading life than do pure brass cases.
That said, I use the ones I scrounge until they do split, and they work just fine for several reloadings. No difference in reloading nor accuracy to the pure brass, just shorter life.
And the split-mouthed cases make fine recycle brass--the scrap metal people don't care about the nickel nor the splits.
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