Initial thoughts:

The Pulstars were alot fancier packaged. If I were to pay $25 per plug, they damn well better look good. They were also the only plugs out of the 4 to come with dielectric grease. Granted, it is only $1 at a local auto place but it is the fact they thought to include it. Also came with instructions and a sticker. One interesting thing about installation is that you are not supposed to use a spark plug socket but instead a standard 5/8th deepwell. Also, the Pulstar instructions are the only ones to include actual tq specs along with dummy instructions (1/4 turn or 1/8th turn after hand tightening). The center electrode is very small. Not small like the Iridium but smaller than the copper.

The NGK Iriduims are what I run in my SRT so there is no surprise with them. Regular packaging with simple 3 picture dummy instructions. Very very small electrode. What I think they need to include is a warning not to gap them using a traditional spark plug gaping tool. The center electrode is so fine, it will break if pressure is applied to it. I was aware of it because I have been using their plugs for years but the regular consumer accustomed to coppers will not know that. Thankfully, Sparkplugs.com writes it on the invoice that comes with it.

The E3s are an odd looking plug. It is the only one that came with a warranty (5yr/100,000mi). Packaging is normal. The center electrode is the regular large size but instead of a single ground electrode, there are 3 that meet in the middle. It is similar to the bosch platinum +2 except for one more arm (obviously) and they all are connected above the center electrode. I dont see how gaping these plugs is possible. These had no instructions at all. Not even dummy diagrams.

Champions are your regular plugs. Packaging is normal. Picture instructions on the back of the box. Nothing really standout about them, they are just regular ass plugs.