Perdition's Blade
Binds when picked up
Unique
One-Hand Dagger
73 - 137 Damage Speed 1.80
(58.3 damage per second)
Durability 75 / 75
Requires Level 60
Chance on hit: Blasts a target for 40 to 56 Fire damage.
Sells for 14 Gold 87 Silver 14 Copper to vendors
Item Level 77
Dragonfang Blade
Binds when picked up
Unique
One-Hand Dagger
69 - 130 Damage Speed 1.80
(55.3 damage per second)
+16 Agility
+13 Stamina
Durability 75 / 75
Requires Level 60
Sells for 13 Gold 9 Silver 7 Copper to vendors
Item Level 74
I currently have the Perdition's Blade and while I'm extremely happy with it and love the damage it does, if I had a choice I'd go with the Dragonfang blade personally. Both daggers have the same speed and the Perdition's Blade damage range is only slightly higher than the Dragonfang. But I think the difference is more than made up by the stats on the Dragonfang. +16 Agility +13 Stamina is crazy for one weapon. Plus, the Dragonfang definitely looks better!
If you ask me, I think the Perdition's Blade proc damage should be increased. 40-56 fire damage is crap and is comparable to the proc of level 30-40s weapons.