It's that outward confidence that turns me off to Yuuno. Dealing with your issues and putting on a good face in public is an excellent trait for a person, but I'm more interested in characters with chips on their shoulders who act according to whatever they're feeling. With Ginko I see her dealing with emotions that she's not fully comfortable with and the conflict is obvious in her behavior and I like seeing that as well as the fact that she doesn't seem to try and hide the side-effects her emotions have on her.

Yuuno is also dealing with emotions she's not fully comfortable with (feelings for Shinkuro + guilt over family) but she tends to hide the side-effects of the conflict and thus is not as appealing to me. When she opened up to Shinkuro and revealed her inner turmoil her stock jumped a bit, but she still seemed quite in control as compared to Ginko who doesn't seem to have a clue.

Now that Yuuno has admitted her misgivings to Shinkuro though she may become more likable