I think Champion plugs are much improved over what they were a few years back. I used to run NGK exclusively, but I see little difference in the two. I had a Champion in my oldest Shindaiwa T230 (came with it). I have replaced it one time....it's almost 3 years old.
Here is the truth... 13 years in the parts industy...... whent to several different plug factories.........champion supplies ac with certian plug numbers and visa versa. no lie .... look for price .......AND MOST OF ALL CORRECT HEAT RANGE THIS IS THE KEY......the only time brand name really comes into play is when dealining with a race engine on a dyno...then you can see a 1 or 2 hp dif..but that a whole nother storie
Champion all the way. Running bad, strange spark issues...check the plug, oh its an NGK. Put a Champion in it, problem fixed.
I have had some Honda's in the shop for servicing, take the plug out to check it. Looks good, gap is good. Put it back. Starts fine. Give it back to the customer...they come back in a few days with a bad plug. After that I see an NGK I dont put it back.
Had it happen on a few brand new Honda engines too. Right out of the box with faulty NGK plugs in them.
Tanaka Backpack blowers too. TBL-7800's. Intermittent running problems within days or weeks of selling them. Pop in a Champion, problem gone. These suck cause its a funky little 8 dollar plug.