What Is The Best Spark Plug ?

What is the best spark plug for an everyday use and weekend street racing on a 383 stroker i had ac delco in it but just change to bosch platinum +4 ? , and what would be the best for a 4.8 and 5.3, 2000 silverado?

bosch platnum 4 i think are the best, but acdelcos work with a cheaper price tag.

bosch platnum 4 i had them in my truck my milage droped and at the time my truck had 130k miles and the oem sparks where in there and etc....and my milage droped like 1.5 miles and it never got any better and a couple of my friends that put them in said the same thing...

the ac delcos deliver the bite for the buck and ive heard accel sparkplugs are pretty good

denso irduims what i now have are the best to me i use to get 15ish miles per gal now im gettin maybe 19ish to 20ish and great performance increase

but not cheap nearly cost me 110 bucks from autozone but i think gas savings are worth it