I find the whole pot size issue to be a bunch of smoke being blown around. I've seen a four foot plant with a huge cola grown in a half gallon grow bag. I've got four plants under two foot tall in two gallon smart pots being grown under two six hundred hps lamps. There are so many other factors that go into determining plant size that too much blame or credit is given to pot sizes. Don't get me wrong, pot size will have some influence on plant size but it is not the over-riding factor in my opinion. Personally I prefer a three gallon container. I start my seeds in three ounce cups, once rooted real good they go into twenty ounce party cups, after that into a half gallon grow bag and finally into their three gallon containers. This grow I used the two gallon smart pots trying to keep the height of the plants under three feet. I fimmed/topped them, pinched out some of the growing tips, supercropped them all and even fed them low levels of P durning vegging. To much P during vegging promotes stretching. For the first two weeks of 12/12 I also kept my metal halides burning in an effort to keep the stretch to a minimum. None of my six plants are over two feet tall and flowering nicely.
My two lemon skunks are in one gallon grow bags and almost as big as the ones in two gallon pots.