Quote Originally Posted by AugustusSB View Post
Allagan is BiS, but only because of the ACC vs SS buff when compared to Holy Zenith
It depends. There's loads of Acc scattered around everywhere else so the Allagan shield is only BiS if you actually need that acc to hit the cap. If you don't need the acc because you can make up for it elsewhere, the acc doesn't really come into it.

Honestly, I'd be willing to say that the Onion Shield is a viable contender for BiS because it's got the insanely high block rate: blocking more for less actually smooths out your incoming damage which makes you easier to heal. Even if you end up taking more damage over time, it'll be easier on the healers, which is what mitigation is all about anyways.