as much as i love new ultron and think people are overlooking his buff, you gotta go with Guardian in this situation. Esp. with the island changes in AW, guardian's value has gone up considerably. Although Ultron is good against Apoc, Guardian is already proven and can do with other bosses too.
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Super useful in many matchups on his own.. then add the synergy on top of it. Slow tactic is legit too, if you play war.