Did you say they are all from seed? Are they all feminized?

It is my understanding that 9 different seeds will produce 9 different plants, genetically. You should see a pretty obvious difference in these plants. You'll probably want to grab one or two of the best and mother them. Or, clone all of them before you go to flower, and then mother one or two of the clones based on the flowered plant's production and any other variables you want to consider regarding the plant's genes and what that meant for its life cycle.