It's better to look at the big picture rather skill by skill:

DRK Defensive skills (not counting HP skills):
-Foresight (20% reduction, 20s)
-Shadowskin (20% reduction, 20s)
-Grit (20% reduction, toggle)
-Dark Dance (30% parry, 20s)
-Dark Mind (15-30% magic damage reduction, 10s)
-Shadow Wall (30% reduction, 10s)
-Living Dead (HP won't drop below 1, 10s) This one is arguably better than Holy Ground since there are attacks Holy Ground won't block.

WAR Defensive skills (not counting HP skills):
-Foresight (20% reduction, 20s)
-Vengeance (30% reduction + spikes, 15s)
-Defiance (2-10% parry based on stacks)
-Inner Beast (20% reduction every Infuriated, if used for it)
-Raw Intuition (100% parry from front, 100% crit received damage from side and back, 20s)

Overall they are very close. Don't just compare skill to skill.