If you have enough health to survive a "worst case scenario" where the mob/boss lands a crit and 2-3 crushing blows in a row, then stick with the armor setup bc. it will conserve healer mana over a longer fight.
If you experience that you are in danger of being bursted to death by large hits, go for the health setup.
If you are tanking stuff that does a lot of magic damage, go for health.