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NGKs or Champions here. Iridiums seem to run just as good as coppers, and last longer, but are a lot more expensive. Unless your application specifically says platinum (HO motor), I'd stay away from them. Don't conduct as well as iridium or copper.
I am running an experiment for my first plug change. The lower plugs are supposed to be platinums, and I am going to install iridiums. We'll see how it goes.
I have the H.O. in my 07, and under the hood it says to use RC12MCC4 Champions, which is not a Platinum? Going to pull a plug and see what is in there and the shape they are in. Truck has 86,000 on her. (Got it Oct. 2011)