The main advantage of some spark plugs over others is that they last longer, basically.
In some applications, they are used specifically for longer intervals for service, which is one reason the OEs use specific plugs. Many OEs have service intervals in the 50-100,00 mile range. (as an example).
Lean mixtures and certain types of fuel also tend to work better with different plug types and gaps. Lean mixtures and high voltage systems are used in new cars for obvious reasons, but another extreme example is nitro.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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