Warrior Infuriated, is it worth holding on to?

[Ditto]

Its not. You rarely need Defiance in T10. While both of your adds are alive put it on, when one dies take it off. If you are eating the charge put it on, then immediately take it off. 10% crit is not worth holding onto stacks nor sitting in defiance.

(This is all under the assumption that you're keeping defiance up for whatever reason. Which for you leads to higher overall damage?)

This would also be worth asking from a MT point of view, where you don't need to hold IB for big hits.