I almost always go for shoulders. I've had 1 black bear run on me, and that was an behind the shoulder double lung shot. All shoulders have dropped.
The longest run I've had deer do were double lung shots. More drops with shoulder shots. That said, I don't have enough kills with behind the shoulder to compare. I've had double lungers drop also.
I think much has to do with the bullet also and obviously every critter is different. I never saw a downside with breaking running gear.
