I have been thinking about this topic a lot lately.
It seems that a combination of topping and scrog training will provide the most yield with most evenly distributed nutrients and auxins.
* Mainlining is cool but less efficient because of the excess stem generated.
*Supercropping is great, but takes lots of energy and time to recover.
* L.S.T. is cool too, but often forces you to remove awkward can leaves and trim stray shoots, probably diminishing the effort of keeping stress low. Then you still get an uneventful plant when you bend them over and tie down etc. I think a big part of efficient growth/nutrient delivery is obviously maintaining an even canopy.
When you top, it allows the plants to do the guess work for you in that regard. The most viable branches rise up to meet the former leader(apical top) and all new growth is distributed mostly symmetrically. This is crucial because it means the fan leaves won't crowd each other, reducing risk of mildew and pests. On top of that, the stems waste minimal energy stretching vertically. (Important for short grow areas like ours)
I started a new mini flowering room recently and plan to do 9 plants in 5gallon buckets topped and stretched to 15" squares to fit in the 4x4 super insulated grow cube. It is only 4' from floor to glass of my 1000w raptor (dims to 600) so I plan to keep my ladies short with 4-8 thick colas each... Maybe more like 8+...
Airflow is key when using this growing style. l will have a 5000 BTU dedicated AC and a small fan in each corner of my cube.
Well then, that's my ramble for now. Stay lifted and please, everyone feel free to share any more ideas