I think the bottom line is the total effect
How much light you have , how much room you have, how much time
Now with the fim you want to maximize all the light.
Each time the main stalk is doubled so are the bud sites. Done at the right time you can maximize the total area expossed to the light.
I have used both ways, fim and hedge shears. But admit fim the first two times make sure you have max effect. One = Two,two =4 and if I have time 4= 8 stalks , after that fim its the hedge shears.
I use a stick and trim all tops to that heigth.
Pot is like a whore if it does no put out its gone.