Is there a huge difference between the two links below in terms of performance and specially life? one is platinum bosche the other is copper NGK.
http://www.ebay.com/itm/6-New-NGK-V-Power-Copper-Spark-Plugs-BKR6E-6962-Made-in-Japan-/271228473422?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2003|Make%3ABMW|Model%3AZ4|Submodel%3A2.5i|Engine+-+Liter_Display%3A2.5L&hash=item3f267a104e&vxp=mtr
http://www.ebay.com/itm/6-PC-BMW-Spark-Plugs-Bosch-Platinum-4-Factory-High-Power-Set-E39-E46-M54-/171513263721?pt=Motors_Car_Truck_Parts_Accessories&fits=Make%3ABMW&hash=item27eefcb669&vxp=mtr