Its highly dependant in your vocation . whether its a solo, duo or team hunt and the characters most important stat (mlvl for mages, distance for paladins and weapon skill for knights).
the go to place for knights and paladins its gonna be rosh west/ asura mirror.
for mages its gonna be falcons/cobras/issavi using aoe runes and spells dependant on eq and mlvl
duo hunting would definately be the soul quest areas or warzone 9 and those exact spots can yield more experience if done in a team