I'll try to answer that. At least from my point of view.
For 15 yrs I've run 12/12 on everything. Of course over the years I've tried all the light schedules you can think of. No major differences but Yeild does increase a bit along with costs and since I run multiple plants perpetually, 12/12 works best for me. I even grow in small 2-3 ltr containers...a bunch of'em....ease of handling is my primary objective along with the best weed I can grow.
As long as your other primary parameters are in check, potency doesn't change much from a stunted flower to a chunky one. Light seems to affect quantity more whereas the other parameters affect quality more....imo.