I have always used NGK in my engines. NGK offers two different plugs for my 3.0 and 4.2 and BOSCH offers the same exact plug for both engines (that would be nice).
NGK is twice the price as Bosch.
What do you use?
Have you had Any problems with one or the other?

I want seafoam these engines soon and need to place my order.

If you mention champion or autolite in your response you will be automatically redirected to the yugo website

 

You don't have to buy it (Seafoam) online. It is available at AutoZone, O'Reillys, or Napa as all carry it. I have no idea about AdvanceAutoParts.

As far as spark plugs, I went with Bosch...as I risk of becoming bothersome with my repetition, I would say to "keep it in the family". German engine - designed with a German plug as OEM part; you can't go wrong.

(I use NGK in the Hyundai, as that's the recommended OEM plug, along with Champion... Actually I just switched to Champion and the engine runs much better. I think NGK is a hotter plug).