to be exact, I said adele because of increase attack skill. and I was under the assumption he had enough silvers. if he doesn't have enough, then yes I agree just go with yuyu. in any case, point here is simply this: you need cc'd witch to clear event. (shadow sorcery)
I'd bet on the green/red onis dying to increase attack skill then yuyu's slightly faster attack speed and slightly more no. of attacks due to range up skill.
point 2: I am simply offering my opinion, the choice is the player's to make.