In my many years of working on Vehicles I have found that there is no magic in Spark plugs. With Plugs that have multiple electrodes all those extra electrodes end up shrouding the spark and in my opinion do the exact opposite of the claims they make. The best plug for power or mileage would be a side or surface gap plug because the spark is almost completely unshrouded from any electrode. I am sure the power difference is minimal if any but some modified cars require a side gaped and indexed plug because of possible interference with the Dome on High compression pistons. I have used about every Spark plug known to man. At one time I owned an old Toyota pickup that I was trying to increase the power and mileage on and can tell you that none of them made a difference.
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On to material. Are expensive Platinum or Iridium plugs worth the money? Well, Copper is more conductive the either of those materials so it should produce a better spark. Now if the plugs are hard to change like a 5+ hour job then it might be worth it but the copper plugs in my Wifes car have over 40,000 miles on them and the electrodes still look good so that one is very debatable even if a plug change is a big job. How to tell if a spark plug is still in good shape. What wears on plugs is the electrodes, as long as the edges on the electrodes are not rounded and the plug is still firing then they are good.
To finish I will talk about special ignition systems like MSD or other aftermarket boxes. MSD means Multiple spark Discharge and honestly it only produces multiple sparks up to 3000 RPM where it is needed the least but the reality of it is that multiple sparks would not