Return of Reckoning

What about 2h Iron Breaker and Snb Iron Breaker in ORvR ? Do they loose value more than Black Guard in these situations? Why?

I hear Iron Breakers mechanic "GRUDGES," isn't as good as its Destro mirror mechanic "HATRED." So my question, is this why the Iron Breaker isn't a popular tank on Order side? or is it the combination of not as good abilities and a worse mechanic ? I see lots of Black Guards on D...