Crystalline Branch of the Brackenspore
Mythic
Item Level 685
Binds when picked up
Ranged Bow
1051 - 1953 Damage Speed 3.00
(500.76 damage per second)
+279 Agility
+418 Stamina
+199 Critical Strike (1.81% @ L100)
+163 Mastery (1.48 @ L100)
vs
Gar'an's Brutal Spearlauncher
Heroic
Item Level 680
Binds when picked up
Ranged Gun
1003 - 1864 Damage Speed 3.00
(477.99 damage per second)
+266 Agility
+399 Stamina
+193 Mastery (1.75 @ L100)
+151 Multistrike (2.29% @ L100)
If I used the tool correctly from Az's guide:
http://i.imgur.com/eHOHVUq.png
Mythic Bracken Bow is 775.5876 value vs the Heroic Spearlauncher at 782.4924