Compare personalities side by side to understand similarities and differences, including:
What they are like to work with: their contribution in the team, leadership, the kind of management style that will bring out the best in them.
Conflict: Do they seek or avoid it, how do they deal with it, what issues will they fight on?
Interpersonal relationships: what are they like to be around, hope open are they, how do they deal with emotions, what motivates them?