Tons of great heads. When I went after bison, I did a lot of research and trial myself. I went very heavy, my arrows were just at 1000 grains and shot a 76# Silvertip. I chose the big STOS head, I don't remember why, the heads were all very comparible. But they didnt require me to remortgage the house like the famous single bevels.
I killed two bison, my first was mine,low and quartering away... it ran about 40 yards and collapsed, then my buddies a couple years later. He had a broadside passthrough that looked beautiful, 2 hours later the buff was very angry and no sign of dropping at all. So we double teamed it and I ended up sneaking the same STOS low and quartering away and that did it.
I've taken two bison and three whitetail;s with that head. I'm shooting a lot lighter now so I downsized back to Magnus and Zwickey.
If you look to the left of the bison below, you'll see my full length arrow nock sticking out of his side. The head lodged into the bone inside, I unscrewed the arrow to remove it, and got the head when we cleaned out the animal with lineman pliars. The head was perfect, sharpened and put back in the quiver and used again as stated above. I'm sure a lot of heads today would produce similar results.