That is why plug manufacturer tries to out do each other, saying their plugs are designed to burn better, for eg. shifting or making the spark more direct to light the air fuel mixture.
Like splitfire plugs, splitting the ground electrode so the spark not blocked.
NGK V groove on center electrode shifting the spark to the edge, again so that spark is not blocked.
Since V groove have been patented by NGK, Denso did a U groove on the ground electrode, shifting the spark to the edge also, and this have been patented by them.
Then you have Bosch tapered cut ground electrode and center electrode also....