Their leader ability is about equal. For damage you want dooku. For utility and survivability you want old ben. So see what suits best in your arena team. In my team both would do well as leader (although I don't have old ben)
Evasion leader is admittedly good to leave in the fifth fight for the AI's benefit, but yeah I'm much happier leading with Phasma than Ben when I break out the weapons.
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Dooku is annoying. But offense up is far easier to overcome than constant turn meter.
Unless you have Dooku, Daka, RG. A stunned enemy cant attack
A stunned enemy can apparently dodge, gain tm, break stun early, then attack.
Thats assuming you can land a stun past the dodge wall
Thats a pretty loose definition of the word "skill".
Some would argue that the skill comes in the strategy, and that strategy is working.
It is not a measure of skill to flatly refuse to use something that works well.
That is the opposite of skill.
You said skill lol