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The SAE (those wacky automotive scientists) published a paper on spark plugs, boils down to copper core are great but you need to change them every 15,000 miles or so, the fancy plugs last longer but have resistance closer to a copper plug after 15,000 miles, the platnum tipped plugs also hold up better under high heat, so if you have a turbo you might want to use them, the ultra fine tipped plugs hold up better if you have an engine that fouls easily like a 2 stroke engine.
The only plugs that are much better then the copper core are the silver core plugs... but they also cost alot more.
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