There are so many variables that each and every one of us will have to experiment to find the plug/plugs that suit our needs. I don't think anyone will agree on the one for all and all for one when it comes to which plug is best. It can simply be what the availability is or the fuel. If you are having trouble then try a different plug. Most times the answer locally can be found with the pilot who flies without dead sticking and seems to have totally reliable engines. Ask I am certain he will not only tell you the kind but where he sources them from.
With 4 strokes the only plug that has wide recognition as the best is the OS F plug so if it were me I would start out with that plug for any 4 strokes I have in my collection.