Axebeard
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Judgments only last until the end of the combat in which you're currently engaged, so I generally think that it's not really worth it. I'd take a +1 to hit over fast healing 1 at pretty much any point, especially when the fast healing is only likely to last less than 10 rounds.
I know you said defensive, though - so I'd definitely roll AC boost first and foremost, as that benefit scales with the number of times you're attacked per round.