Barriss by a mile. Old Ben is slow as hell and hits about like Barriss. Barriss is a healing machine. Her leader ability grants health at EACH turn, she heals through immunity, even her strike heals. Ben's mind trick is cool but only lasts one turn. Only advantage is when he dies. The AI avoids hitting him if you consider that a plus. Go Barriss, she's invaluable in GW.
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I was leaning more towards him but I didn't know who was better