Bandit choices for Oro's Sacrifice/Flicker Strike?

Just a quick question to those more mathy then myself. What would be your bandit choices for a life based Oro's Sacrifice Flicker Strike Duelist-Champion build? Normal seems to be an easy Oak. But in cruel I cant decide between 8% attack speed or the passive point, and in merciless I can't decide between frenzy/endurance charge or the point...

Any help would be appreciated for when I wake up in the morning, lol. Logged out for the night right when I got to the bandits in cruel and decided to turn to the community for help, so that I might not mess up this character before I even get to equip my Oro's at 67. lol

Normal and cruel choices won't make or break anything, you can just kill them and not think about it ever again. Merciless bonus is more impactful as there aren't very many sources of extra charges, unfortunately, to decide between frenzy and endurance you would need to know in advance which will you need more in lategame - offense or defense.

Frenzy charge is what I would choose for an Oro's flicker build. The more you build up, the less chance you have of a string of bad luck ending your flicker streak