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I think they're honestly really close in that regard, but I'd have to give the W to Iridium. It has a ton of metallic flake, making it almost look like a matte paint to some people (I've been asked if it was matte before, believe it or not).
Here it is after driving on a salty road. I think you can see the dust and whatnot - but also, consider that this is basically as bad as it gets.
edit: I originally said I owned both. My bad, for some reason my brain thought this was yet another Atomic Silver versus Iridium thread. I have driven a Cloudburst ES as a loaner car. I had it for several days. I really, really, love that color to be honest. However, I don't think it's quite as good at hiding dirt.
Wow, that looks like it just came out of the carwash!!