It's been my general experience, (and that of many owners) that our cars just seem to like NGK plugs over any others. Don't know why this is the case, but it seems to hold true for me.
They're virtually the same price as anything else, so I choose to run them in all my vehicles.
You certainly can run whatever you want.
Jack, when the book was written, there weren't a heck of a lot of choices available.
Jeff