I don't think anyone knows for sure how much better they are (or which of the Lucky or Blessed are better) but I've been using them just in case, because I "heard" that there's less chance of actually breaking the item. From personal experience, I seem to be more successful with Lucky ones, but that's just me. It's probably random anyway.
But anyway, I know someone who upgraded their weapon to +6 with regular elrues/lixes just then, so now I'm not sure either! O_O!
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