With big boards I feel you can run mono or braid. I run mono on little boards. That's a must!

On big boards on the charter boat it's all 30# PowerPro! With cranks, I run a 6' mono leader with a swivel on one end and a snap on the other. Make sure to use the snap on the crankbait end. Nice thing about this setup is when I am ready for TT's and spoons...just replace the crank with spoon and add the TT in between the braid and mono and you're ready to go.