My Opinion is #1 Woodsmanship
Tied for #2 & #3 Calling and Patience
You have got to "read" a bird. Then decide whether to shut up or talk to him some more. In my 35 years of turkey hunting I, like many here have kilt a pile of turkeys. My Daddy is a turkey killer and has been for as long as I can remember. I am a better caller than him, but if given a choice, I would leave my calls at home and just bring him with me, LOL!!! Every year I learn a LOT.
Good Luck and God Bless
Ray