To be honest, I am not really a fan of Bosch spark plugs. A quick google search will show many people's negative opinions about them. I went for the NGK Iridiums. I don't buy spark plugs every day, they are only four, might as well go for the best NGK has to offer (I think).
If you want a plug that conducts more electricity, go for copper.
If you want a long life plug, go for platinum.
If you want a bit of both, go for iridium.
You will not really see much, if any, of a performance improvement with spark plugs though.
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