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What's the difference, apart (I assume) from the price?
The stainless ones are made of stainless steel, and don't corrode very badly. The plated ones aren't, and do. There's very little difference in price, it's hard to compare as few outlets bother to stock both so you might easily find the stainless ones cheaper at one shop than the plated ones are at another, but in theory the stainless ones are about 25% more.
I'm not mad about their plated ones, but the stainless are sound.