I've done both, and though a SOG looked neat, it didn't outyield my old bushes. It took a lot more work, more pots, more soil, more clones (it seems impossible to get enough clones) and was just a pain. Tried a 5 day and a 7 day veg SOG, with anywhere from 9 to 32 plants per 4X4 tray (couldn't fit more with 2 gallon pots) and though it is very strain-dependent, overall yield was greatly diminished. I got a 3 and a 4 pound harvest out of 8 lights, and though there were some problems with the first crop, the second one went pretty well. Not worth it to do on a commercial scale I decided.
Now I'm going back to a 4-week veg with bare bulbs hung between trees (a la DoubleD) with staggered lighting (a la Hydrosun) and Blumat autowaterers (a la Sunny Dog)
Fuck SOG, unless you can produce unlimited clones and can cram a "just-right" spear indica into small pots and pack a ton into trays, it's just a bitch.
Which would you rather have, a room full of these:
Or a room full of these?
Dewd, a SOG is "4 plants per sq foot" NOT "4 sq feet per plant"
Those look about spot on if planted correctly!
I can tell Yosemite has spent some time in the trenches