What spark plug brand is best?

I am going to get new plugs for my car to increase efficiency and for more power. I know it is the best upgrade i can do, but i know it will help my car. I am looking into getting iridium spark plugs and can get Bosch, NGK, Champion or Autolite. Which is the best brand to buy? thanks
Update: sorry, i forgot to mention my car. It is a 2003 Camry Se 4cyl. I want to put new plugs in for better preformance and gas milage. I know it wont improve much but my engine will run more efficiently. I had been looking at the Bosch Platinum 4 and the Bosch Ir Fusions because i can get them the easiest. Are these... show more sorry, i forgot to mention my car. It is a 2003 Camry Se 4cyl. I want to put new plugs in for better preformance and gas milage. I know it wont improve much but my engine will run more efficiently.

I had been looking at the Bosch Platinum 4 and the Bosch Ir Fusions because i can get them the easiest. Are these plugs any good and which one has better preformance and which is overall a better plug? Thanks
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