Everything boils down to availability. Plants in sandy, unfertile soil, tend to develop much shallower, and wider root systems, as they search out water and nutrients. Plants in compact, clay-ish soil, don't wander far, and often grow quicker, and stronger. Sunlight figures in there, as does carbon in the soil/media. Everything is a game of allocating available energy.
Â
Big pots are unnecessary if your growing season is short, and you don't plan to treat the plant as a perennial. If you keep the plant happy in small pots, it will keep you happy. It doesn't need to have giant foliage or huge trunky stems. What matters is fruit output.
Â
I did grows over the years of huge pots, and tiny pots. Tiny pots will make a lot of fruit in their respective space. You can plant more plants, and feed less, over a single growing season, in my experience. Huge pots made huge plants, and made my post-winter recovery a better proposition. I pruned everything back to a main stem, and big plant had the same early season explosive growth as the small plants. However, when I really quantified it all, I believe that I got more production out of many smaller plants in smaller pots, than fewer ones in huge pots, when comparing resources. At least until some of my better plants were in year 3 or 4 of life, when the big plants made crazy big yields.
Â
Bigger pots are always favorable when you are growing with a lot of added organic material. (over small pots)
Â
I know it was a simple question, but it has a fairly complex answer.