i am not an instance person myself, im my whole rogues armour/weapons and build are PvP based Stam, Agility, Attack power and +crit chance. With duel swords if found it very easy for PvP as sinister strikes are hard hitters no matter what the armour is and for PvP i found it easier then using daggers.
Where daggers are burst damage from ambush and the smaller damage in toe to toe i found that it took a bit to take the mobs down
with swords the DPS is on going, i dont get the 1000 crits at the start but in the 3 seconds of cheap shot I can pull off over 900+ dmg no problems and then carry the same dps whiles toe to toe