Those long, thin leaves indicate it's a sativa dominant plant. Indicas have the short fat one, sativas the long thin ones.
I agree, 5 gallon pots can be a PITA indoors. Weigh a ton when they are wet. Personally, I'd rather have six 3 gallon pots than four 5 gallon ones in a given space. In the end I think the total yield would probably be about the same.