Special, you will be better off using that because Zoroark has a better Special Movepool, Higher Special Base Stat, and Zoroark's signature move, Night Daze, is Special. A moveset for a Special Zoroark can be this Moveset:
Nasty Plot/U-Turn-Double that Special Attack Power or strike hard and then dissapear
Flamethrower-Singe those Bugs to ash
Night Daze-Get that huge STAB
Hope this helps...