I saw someone demonstrate an Atlatl back in the late 80s when I was in boy scouts. The speed and distance is insane, similar to a modern day javelin, but with an extra 3ft moment arm. More comparable to the "Feet bow fire method" than from a single arm drawn bow. I would think Atlatl fired in groups would be much more effective in bringing down bison than a bow and arrow, particularly when bison are grouped up. Similar to a "buffalo jump" for group dynamic hunting.
Against a deer or smaller animal, bow if far superior.
