My VW HATED the platinum plugs, so I switched to copper. I think it's more of an issue with the older engines.
Now that the tune up intervals are longer, the switch to platinum plugs is for longevity more than performance. Whatever you decide to use, put some anti-seize compound before installing the plugs. After a few years, the plugs pretty much weld themselves to the head, making removal best left to "divine" intervention. You can do a search and find all sorts of "I can't get the g@#(@#mn plugs off!" and "F@&#ing plug broke off!!!"
I paid $10 for the pink stuff at the dealership. Cheap insurance.
Enjoy the car for many miles of service!!!
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car