I don't know -- I have 6 plants in flower -- I put 4 in 3 gal pots, 1 in a 1 gal. pot and 1 in a 5 gal. pot -- they are six weeks into flower, and the best looking plant in the tent is the one in the 1 gal. pot. I have had this argument before thinking bigger pots made bigger buds -- now I'm thinking bigger pots are necessary only if a person wants bigger plants (monsters) but for a deceint size plant, say 3 ft, a 1 gal. pot works nicely. I may change my mind in a few weeks when time to harvest, but that is what I am seeing now.
Peace