To me, the BiS S/B combo is
[Shieldbearer's Herald of Anathema] with
[Sentry's Chaosaxe of Tyranny] or
[Sentry's Chaosaxe of Anathema] (strenght instead of regeneration, a bit more wounds/toughness).
I don't like the disrupt bonus of
[Sentry's Herald of Anathema] because you can easily have access to disrupt thanks to
Hold the line and I prefer the parry bonus of
[Shieldbearer's Herald of Anathema] to parry guard damage.
I tried a few times the
[Fortress Guard] but I didn't notice if I survived more during WB raid thanks to the absorb proc, so no reason to take it.
For weapons, I tried to avoid critical chance bonus because this is not my job as S/B to do damage. So, no
[Fortress Labrys] and
[Titan's Sword of Anathema].
Between
[Fortress Cleaver] or
[Sentry's Chaosaxe of Anathema], stats are pretty close. With the right amount of
Futile Strike and
Initiative, 1% reduction in being critically hit is not that much compare to 2% armor penetration reduction.