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i dont think size matters much as far as quality and health of your plant goes.but i hear auto's are going to be a tad smaller regardless. making them ideal for "bonsai" grows. which would be put in small cups/pots. just as long as you have room for desired root growth i think anything is fine. 3-4gallon-ish per plant, but since it's auto maybe a bit smaller. since they do have ruderalis genes.
Container size controls root size controls plant size. Bigger container = bigger plant, smaller container = smaller plant. To know the answer to your question, all you have to do is define "best".
Autos are best put in 3-4 gallon pots, up to 5 can work. It's best to put them straight into the final container from the start, they don't like being transplanted.
I say this from never having grown them myself, just what I have learned from watching and listening to others.
-------------------- Dude she isn't as young as she use to be.