THe best arrow is one that has 24 to 26% F.O.C. These will be the most accurate, close to the fastest and provide good penetration. Finding these parameters maynot result in the "heaviest arrow". There are many arrows that will fullfillthe requirements. To me, it is fun and interesting experimenting with different arrows.
The bottom line is the critter is dispatched in a humane way. Whatever works for you is what you should use!! The critters don't care if they are shot through the bottom of the heart or the top, Dead is Dead!!!!!!!

Using common sense and knowing your limitations, no matter what you use is the key!!