Out of these two, Epidendrum is the way to go. You're going defensive route, fights will last longer, and Cactus's low stats will really hurt you in the long run.

But, have you considered adding Victoria with provocation to the team? With 60% attack reduction, she should be able to hold her own for a while, even without evade. And then, double skill activation, combined with her and Bonci's buffs to skill damage...