Invective is the quickest to complete though maybe not the easiest. Bad Juju is easier but takes longer in my opinion. However with the thorn and bad juju buffs supposed to be coming eventually if you like hand cannons thorn may be worth stashing. I have all 3 stashed, when I got another exotic bounty with those 3 choices I just plain abandoned the bounty because they just aren't worth the time investment to dismantle.