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Neither. R2D2 could solo both of them.
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That is factually incorrect. HK-47 and HK-51 are both highly advanced assassin droids. RD-D2, while extremely good at what he does, is an astromech without weapons capabilities unlike T3-M4. Before R2 could get even close to either of the HKs, they would just gun him down.
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Have you seen R2D2.... He does not die. And yes I'm aware they're assassin droids; I was just making a joke.
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I liked HK-47 more.