Both. QGJ for offense. Dooku for defense. I am soon going to be leaving a Dooku(L), Yoda, Rey, Daka, QGJ defense. Can't wait to see how much better I hold rank.
This really depends on the team. In the standard meta team QGJ is far superior... that said I've seen several Dooku lead teams that are purpose built evade teams, and they are a huge PITA to fight. I avoid them and go for the QGJ team every time.
i think dooku is since you can really pair anyone with him cause they'll all recieve the leader bonus. Not to mention, on defense the evasion seems to be a higher chance.
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On Defense I switch to Dooku. Defenses are terrible - randomness is needed.
I can beat QG teams more often than the random-evade of a Dooku lead team.