Here’s tbones topping info. This was a few years ago though so his stance may have changed I don’t know.
Growing in an indoor environment you have to sculpt your plant to it's surroundings to get the most yield. The scrog is the evolution of the topping and sea of green methods. Indoors to get the most gram per watt / per square foot you want a top sitting in the ideal spot for the light in every square inch of the room. This will never be done without topping the plant. The second part of that is training. You have to top and train. It's not enough just to top. That's where scrogs and supercropping come in.
I grew my first GDP crop only topping one plant the rest were straight up stalks. This second crop I've topped about 3 times each plant.
When you top is really important as well. You want to work the first top in as early as you can so you have a big fork way down on the plant you can start spreading apart. I also used strings to pull the tallest tops off to the side. This allows the middle of the plant to catch up to the outside. The smaller of the two is almost perfectly trained. The other has some tops outgrowing some. These are two phenotypes of GDP one is a stout short tight noded indica dominant the other is more stretchy and a much more voracious grower. I'll probably dump the small genetics. The bigger one is also more colorful. I have 10 tops on the small plant and 12-16 on the big one. I'm hoping for at least 50% more yield than last crop. I also have 50% more light and 50% more nutrients so that should help. =)