I find spark plugs are like oil & beer. Every guy has his own preference & he'll spend hours telling you why his oil, beer or spark plug is "the best".
We have dyno tested & raced everything from split prong, 1-prong, 2-prong, 4-prong, no prong ... from $1.99 plugs to the $18 Formula 1 plugs from Brisk ...
I'm not saying there are not differences, nor am I saying the spark plugs don't matter. Just the opposite, the plug selection of tip style, heat range, gap & indexing are key to optimum power. But a lot of brands make good plugs ... just like there are many good oils & beers out there.
If we had found a brand or style that was superior ... we would have locked onto it. But, in all of our years of dyno testing & racing I have found NGK's & Autolites are as good as any other brand at building power. Not better ... just as good. The bonus is NGK & Autolite plugs ... are available almost everywhere, come in wide range of heat ranges for each application & are often very affordable.
So NGK & Autolite are my first two choices, but we've had good success with Denso, Champion, Bosch, Motorcraft & AC Delco.
If you're going to run a radio or data acquisition, you will need resistor spark plugs, which can make it harder to find in the really cold ranges.
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