best for spark transfer; dull or sharp edges?

RustyRatRod said

Can you post your information source on that? I've always read that copper conducts better. As a better conductor, it would seem that it would take less voltage to fire, right? The only benefit I'm aware of with platinum, iridium or any other "exotic" metal is that they simply last longer.

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This is correct. All the plugs with other than copper electrodes are there for one reason and one reason only and that’s extended mileage. Nothing else. The OE’s had to go to them because most people don’t change their plugs often enough (much like oil changes) and the computers get pissed off when the plugs start to fail and cause misfires.

Plus these new cars (most of them anyway) are a real ***** to change plugs.

They are not performance plugs. Not by a long shot.