PG was planetganja. doesn't seem to be alive anymore.
SOG will still give you bigger yields, no meter what the space it - just means more work taking care of more plants.
the idea behind SOG is have more main colas rather than letting side branches grow, resulting in... more yield.
there are plants that react well in sog, some doesn't.
I grow pretty much SOG right now, you can check my journal.
However, it is more work.