Quote people when you reply. The @stuff is annoying and not as easy to follow. Thanks.
@Jotawarr: The stat priorities are still the same. Hit is still more important for TG than Mastery. Stack as much hit and crit as you can, even past the cap.
@Namitsoo: Assuming you can gear for both and are equally skilled at both, Fury will typically outperform Arms on Spine of Deathwing, but while Fury will have more boss damage on Hagara during feedback, Arms' AoE damage for Ice Tombs cannot be ignored. The stat priorities aren't all that different, but if you can, you should swap in more hit gear for Fury, as if you are optimized for Arms you will only have 11% hit with Precision. Reforging between bosses would only be something you do for progression. Your guild won't be happy waiting for you and it's pretty expensive. You still want to stack crit at the expense of mastery and haste. Arms has a significant advantage on Mor'chok, Zon'ozz, Yor'sajh, Ultraxion, Blackhorn, and Madness. The only fight that really favors Fury is Spine because of cooldown usage on Tendons.