Quote Originally Posted by shao32 View Post
no, they are not similar but fall in the same category with is mitigation utility to the raid, SIO is superior in all sense bcs shield 8 person every 90 seconds for almost every important raid damage, to shield 8 person with TBN you have to spend 120 seconds.
You can pretty much turn this statement around and say TBN is superior to SiO because TBN mitigates tankbusters way better than SiO.

It's hard to compare those two abilities on the same usage, since they are not made for the same thing.