Plugs are an incredibly simple part. I've never had a problem with any brand I've tried.
Maybe the problem wasn't Champion, but the type of plug you were using (non-resister vs resistor type) I know some of my equipment specifically calls for the resistor type (R in the part number designation) as the non-resistor type will sometimes interfere with equipment sensitive to different frequencies.
ex. Champion CJ7Y vs RCJ7Y. Same plug just one has a resistor.
I have used all different brands of plugs and never had a problem as long as I used whatever the manufacturer recommends. (I can't believe I just said that.) Just my two cents.
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