Originally Posted by
Seraphor
Unfortunately theres not much space on xhotbars for all of the roles skills, and most tanks I know, or at least DRKs, choose Awareness over Anticipation.
In real terms, in the perfect situation, they each translate into a ~4% mitigation.
However, Parry is only valid against physical attacks, and Crit is checked before Parry (if you receive a critical hit, it can't be parried) so there's no point in using both at once.
In addition, WAR require Awareness for Raw Intuition (probably why they save it) and I believe PLDs base parry rate is lower to account for shield blocks, so Anticipation isn't as effective for them. (probably why they don't use it)
If you're playing with keyboard and mouse then sure, it's free mitigation, when it works.