Any hit on a whitetail has to due with one thing and one thing only - the amount of damage you do from entry to exit or the point the arrow stops. The more arteries, veins, and tissue you cut - the faster they die. Liver, lungs, guts, etc...

This is why I use a big cut on contact broadhead. No possibility of a single lung lost deer when you're pushing 1-3/4" worth of blade through the boiler-room of a whitetail. I've seen too many fixed head hits that resorted in lost deer because they just didn't cause enough damage.

Just my opinion of-course!