What spurkplug should i be using on my trailblazer

It depends in 2 thigs , 1, is to use the one recommended by the manufacturer and the most important one, and 2, it depends on how your walet is doing, there is few different brands and prizes, i think when is about cables and plugs you should get the best for your car it will save you money and your car will run better in all ways I hope this will help you Thanks