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Hospital Grade is probably more meaningful to audiophiles for receptacles versus plugs. Hospital Grade receptacles have higher blade and ground contact pressure versus standard receptacles.Steve
If my choice was metal A contacting metal B vs. any two matched metals on both sides, I'd personally select the latter every time over the former (no matter how costly was metal A or B).
And since there is no exact standard for base metal and plating (both metallurgical and hardness) you will get closer to that ideal with matched plug and receptacle from the same manufacturer/series.Steve