@CML Yes outside. Giant sativas are fun to grow but take a lot of work. I won’t use anything bigger than a 10 gallon pot inside.
Your average 3 to 6 foot photo will be fine in a 5 to 10 gallon pot though. 7s are perfect imo. You can grow photos inside no problem. Depending on their size you can either do a short veg and flip to flower after just 4 weeks or so or you can use height limiting techniques like topping, fiming, or LST. With sativa photos in a 6 foot tent if you don’t want to top or scrog I would flip to flower when they reach 1.5 feet tall because they can stretch up to 3 times their size in flower. Indicas I’ll flip about the same time if grown with some sativas but if grown separately I’ll flip them later because they only stretch maybe twice their size in flower.