Hi guys when I played last, Hemo was not a build that would ever be used, it was always backstab when behind the target, but I've been hearing that Hemo is potentially better now?
From what I've heard it's a matter of skill/preference.
Hemo is viable but deals less damage. While Backstab will net you better damage but requires the positioning to dish it out.
Both work in most situations. The thing about it is that the hemorrhage builds offer a little extra survivability at the cost of general burst damage.
Better? No. Neither build is really better for any purpose except the following 2:
Playing 2v2 with a healer. Backstab is your only option.
Playing 3v3 with a resto shaman and a warlock. Also known as RLS. Hemorrhage is generally viewed as the better spec because it is more management and spread-output effective. Which is also what the warlock does. Together theise are potentially more deadly than a spiky burst damage rogue.