LST for sure, along with topping and/or FIM. Basically the FIM and/or Topping will help slow that vertical growth to help with keeping an even canopy. Ultimate goal is an even canopy with as many tops as you can handle, too many tops could result in you having too much horizontal space to cover with your lights so you have to expirement and find the right combo for your working space. But in the end both methods would be advisable together.