rib bones or leg/shoulder bones. Rib bones would not be a prob. with either head. Leg/shoulder bones are a completely different "animal". IF you hit the flat part of the scapula you NORMALLY pass through and then you can come on here and show us pics of the deer and say this head performed perfect on a 'shoulder hit'; IF you hit the ridge of the scapula, NORMALLY you will be on this forum with a different outcome on the 'shoulder hit' asking why you got 2" of penatration.

I wouldn't beat yourself up too much....either head is going to perform awesome in most situations. Just pick which ever gives you the best kill instinct!!! good luck