Which is better DPSFollow

Assassin is generally given to be the highest DPS among scouts however a well played ranger will often parse right up at the top of the heap during a raid.

Bards - both troubies and dirges - are support characters and are much more iportant for the buffs/de-buffs they provide then for their DPS.

Your biggest choice comes when you have to decide whether you prefer a melee or ranged play style. Rangers are outstanding bowmen and do their best work from a distance while Assassins are melee kings and do their thing up close and personal.

Your choice will come down to the way you would prefer to play.