A difficult one... But I have to go with the Erinyes devil might win the cake here. Their look as fallen angels draw me to their story more than most of the other creatures of this type. They are archers that also make awesome warriors.
Yet with their core abilities as warriors, I have also seen them used successfully in a variety of other roles: diplomats, spies, and concubines.
For more beat-stick I do like elementals, but these are mostly as straight-up combat brutes.