a moose would be the easiest big game animal to shoot. I doubt they would be the easiest to kill. mike w
Their vitals are no different than elk or deer, one properly placed shot is no different in either of them. 
Except that the vitals are larger, resulting in a larger area to properly place an arrow. Should mean that a moose would actually be easier to kill than a deer, except that an arrow has a better chance of penetrating a shoulder blade on a deer, than a moose, if the shot is poorly placed.