You can run one very large plant, a couple large ones, several mediums, or a bunch of small plants...
Size of the pot itself doesn't matter. You need to gauge what size plants/training&growing techniques will work best for your grow place/equipment, and then size your pots according to that.
For example, I run a small 2x3x5.5ft tent. I've had 4x 5gal pots, 2x 10gal pots, and I'm currently running one 18gal sub irrigated tote. My most limiting factor, is height, so I have to use SCROG/LST techniques to help keep my canopy low/wide, so I can make the most of my small space. I could also run about 12 0.5gal pots in the space, but thats not my preference.
The reason I mention all of this, is to show that pot size is fairly relative, and should moreso be determined by your grow style, space limitations, and equipment... otherwise pot size is just an arbitrary decision in the whole process. Especially in terms of super soil, because that's used in terms of volume of soil relative to pot size.. so regardless if you grow in a 1gal or 10gal, your still putting roughly 25-33% super soil or w.e the case may be.
If you plan on doing no-till, im not going to suggest a specific size container, but larger is better for the most part. More soil = opportunity for larger/more diverse soil food web.