Vertical has it's merits, where yOur previously reflected light is now directly cast. This is mOre efficient, but I'm not certain it's more productive per lumen than sog or scrog, which are less efficient w/ reflectors, but more lumens per square inch if the lamps are the same. This is because you get the direct cast light, plus the less powerful reflected light.
Vertical does not get this same intensity as it is cast only once, you don't get the other side of the lamp reflected onto a specific point. Apples and oranges.
SOG- best yield with no plant limit, especially over time
ScrOg, Fim lst- best yield with limited plants
Vertical/tube: most efficient use of light (no relectors).
All is my oppinion and subject to Callin BS. Ha