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Use a quality plug. That's what matters more than anything. A good basic copper NGK or Denso will be more than sufficient to have a good running bike.
The big advantage of iridium is how hard/tough it is. Due to it's tough nature the electrode can be much smaller than a standard copper plug. The small nature of the electrode means that the spark generates from a highly concentrated area which results in easier starts and lower required voltage to operate. Basically stronger and more consistent spark from the same coil setup. Since Iridium is also so tough it will basically last the life of your bike unless it suffers some sort of damage.
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