Originally Posted by
honung
Sustained damage of Assa and Sub are fairly similar, but Assa has a 24% healing reduction in Wound Poison which is a huge deal. Assassination has way more burst, and every Kidney is fairly threatening. When you have Kidney, Vendetta and Kingsbane it's a ton of damage.
Another thing to keep in mind is that Assassination's traits are very powerful and that could make it pull ahead as time goes on. All three new traits are good, especially the golden which is crazy. In the old tree there are plenty of powerful three-pointers that you can put a fourth point into. Vendetta CDR, Poison damage, Rupture damage, Envenom damage, Rupture crit. Subtlety's new traits are mixed. The new four-pointer is very strong, but the other two are bad. Most of the three-pointers in the old tree kind of suck, with the only one that really stands out being Eviscerate crit. Shadowstrike and Nightblade damage are also okay, but you're not Shadowstriking that much when you're going for kills anyway.
But on the other hand, Subtlety is getting big changes next patch so who knows what's going to happen.