That's an easy one.....TEXAS!!!
Seriuosly....With a shotgun, always the neck/head(with the shot used in turkeys loads they can not penetrate the bodyreliable enough to reach the vitals)
With a bow the jucntion where the leg meets the body with regular broadheads or turkey points. The vitals on a turkey are very small and shot placement is critical if you want to humanely harvest a bird. I have not used them but with a turkey guilotine, head and neck shots are reccomended.