If you dont have proper lighting, having a big plant will only make you life more difficult and probably decrese the yield. Check out the grow in my sig (I finished and harvested, but nobody seemed to be reading it, so I didnt bother finishing with harvest results). They got to be around 7 feet tall. With proper lighting and me having not fucked up, it could have been a much larger yield. In the end I got around 1-2oz per plant. You can "supposedly" get 2-3 oz from a straight from clone doing it right (dont ask me how to do it right, I have no idea, I am currently trying my first time). Some people go straight from seed 12/12, with absolutely no vegging.
Since you didnt know about veg time being however long you want it to be, its probably safe to assume you dont have a lot of experience (its okay, neither do I). Larger pots, make for a more difficult potting, more cost for soil, more hassle for moving them around. If you use nutes and are gonna flush, good luck, hope you have a good system. Ever try and move 10 gallons of water with a turkey baster? How about 40 gallons every other day for 2 weeks, I have, it SUCKED.
Basically, plants tend to produce based on the amount of lighting, not the size of the plant. If you have like 7 1000W lights for like 5 plants and you have it going around them in a dome shape, and rotate them everyday, then ya, you could probably grow some baller plants with up to like a pound per plant. They will be huge and you will probably need to tie them up, unless you have intense fans blowing on them from like every angle. In the end, everything that isnt directly under the light, will pretty much be popcorn buds. Making them bigger pretty much just gives you more popcorn to play with.