Beyond what's already been mentioned, my tillering tree is set up to mimic my holds on the bow and string. It's also designed to be versatile, able to be quickly set up to mimic other archers' holds on bow and string. That cannot be done with a tiller stick either. Also, with the rope and pully system, you can stand back and watch the limbs work, getting a more dynamic view of their action, reflex straightening out, recurves opening up, etc. I only ever used the stick on my first bow.