if your boosted or on the bottle go basic ngk. if your looking for good plugs for your stock car go iridiums
the difference between the two plugs durring NORMAL use is iridium will show less wear after X amount of miles they will show less than platinum will both of these plugs have basically become oem equiped from the factory since 1996-97 about 98% of the cars and trucks that come from the factory will be equiped with a so called precious metal plug