Just curious what difference do you see in different brands of spark plugs? If you got the right plug for what ever peace of equipment its in. I just can't see what difference it makes because as I see it they all do the same job. Start better,run better, last longer, cheaper to buy, easier to find, you must have a reason??? which I don't understand. I know different style plugs last longer which cost more to buy but I have never seen any different in the way the engine starts or runs by brand plugs that's in it. Just curious nothing else. I know as for myself I buy what ever brand the store has which I am buying it from.