I want to replace the spark plug on my Harbor freight pressure washer, its a F6TC plug, its the original and China made.
While I'm at it I should replace all the plugs on my 4 cycle engines that power the other small engines in the garage.
I have used Champion and NGK before.

What are the current manufactured plugs that users can endorse?

NGK in my Midget
Bosch in my Mini

My only small engine with a spark plug is my Stihl 2-stroke trimmer & it's still on the original plug and runs great.

if i have a choice i run ngk in everything

NGK for the win. Champions have been garbage since the 80's.

Autolite would be my second choice if I can't find what I need in NGK.

I don't do a lot of messing with small engines but I have used Champions without issue. NGK is limited use but has also been fine.

NGK for everything. No need to overthink it. Best plugs for the money and never seem to go bad. Definitely haven't gotten any dead plugs out of the package like I have with many other brands.

Champion or NGK, No problems with either, and they both are going to be better than what you have in there now.

Champion or NGK here and only ethanol free high test in any of my lawn equipment.

After I broke in my HF generator I did some research on what plug to replace the Chinese one with and decided to go the NGK route and have not been dissapointed.