PvP - Dagger vs Sword (Backstab vs Hemorrhage)

I currently have the option of going Lobotomizer+Bonescraper or Vis'Kag+Mira's Song
(http://db.vanillagaming.org/?item=19324+http://db.vanillagaming.org/?item=13368
vs
http://db.vanillagaming.org/?item=17075+http://db.vanillagaming.org/?item=15806
I'm debating if I should stay with my backstab spec or swap to Hemo.
What would be the best thing to do?
(http://db.vanillagaming.org/?item=19324+http://db.vanillagaming.org/?item=13368
vs
http://db.vanillagaming.org/?item=17075+http://db.vanillagaming.org/?item=15806
I'm debating if I should stay with my backstab spec or swap to Hemo.
What would be the best thing to do?