User blog comment:Linathan/Unit Spotlight: Valkyrie Archangel Griel/@comment-26186382-20150624130610/@comment-71.2.39.131-20150624162740

However, Def Down and Weaken rely on RNG to inflict. Ignore-Def, on the other hand, is guaranteed and can easily be re-applied so that's why it's always better. True, it can be removed, but if you are able to get your BB/SBB up every turn (which should be the case, otherwise the squad will fail miserably), you will always be able to get the ignore-Def buff up and running.