this is a somewhat contentious and ongoing argument. Each school of thought states that each method to stop a nitro engine has it's merits with the method used by a particular individual being good whilst denouncing the "other" methods being used by other individuals as poor or no good.
Personally, I either use the fuel line pinch or stinger plug method, even though i prefer the fuel line pinch option.
Then of course the is the "stop the flywheel with a stick of wood or shoe" method. ood in an emergency situation, but it does stress the conrod by stopping it dead whilst it has rotational forces fromn the crank working on the bottom end.
How does a 1:1 car switch off ? by cutting the electrics, which means cutting the fuel pump off and stopping the fuel supply, whilst also stopping the spark to the spark plugs.
Point being, to starve the engine of fuel to stop it will not neccesarily hurt it as much as flooding it can, as much as stopping the flywheel can and as much as putting your finger or thumb over the carb to starve the engine of oxygen that at the same time could introduce harmful grains of dirt into the engine.
as I said, a contentious and ongoing argument.
In short, everyone has their preferred method, but sometimes it just best not to talk about it for fear of being told out right that you are wrong or stupid for using that method as has been the case in the past.