PositionEntity positions/moves an entity to the co-ords you specify. TranslateEntity moves an entity along the World Axis. MoveEntity moves an entity according to the way that it's facing.
Basically, TranslateEntity moves an entity FROM it's current location, plus the x,y and z you put in :o)
Basically, TranslateEntity moves an entity FROM it's current location, plus the x,y and z you put in :o)