Which is better?
At the start of the Combat phase, if you have no shields and at least 1 Damage card assigned to your ship, you may perform a free evade action.
or
When defending, you may reroll 1 of your [Eye] results. If the attacker's pilot skill value is "2" or lower, you may reroll 1 of your blank results instead.
Both are defensive. Ysanne gives you a (just one) free evade which is nice, but that is an action and not available if you're stressed. But the other lets you reroll whenever you are attacked.
Edited by Ken at Sunrise