Heart/lung almost every time. I have rarely taken a neck shot when that was the only thing available and they were close. I NEVER take a head shot.
My primary concern is a reliable humane kill. Heart/lung takes them out fast when using the right bullet and is very reliable. A neck shot can drop them, but if it's a little high it may only knock them out and when they regain consciousness they will get up and run. Obviously a bullet to the brain is the fastest kill. The problem is that if you miss just a little you can destroy their muzzle without inflicting a fatal wound. That can result in a long suffering death from dehydration, starvation and infection.
My primary concern is a reliable humane kill. Heart/lung takes them out fast when using the right bullet and is very reliable. A neck shot can drop them, but if it's a little high it may only knock them out and when they regain consciousness they will get up and run. Obviously a bullet to the brain is the fastest kill. The problem is that if you miss just a little you can destroy their muzzle without inflicting a fatal wound. That can result in a long suffering death from dehydration, starvation and infection.