We ate at both YS and Citricos last month. Between these two,for us, the winner was definitely Citricos.
We had terrible service at YS. In fact, it was the worst I've ever experienced on Disney property at a signature restaurant! Also, the restaurant was SUPER NOISY that night. I know some people complain about CG being noisy, but this was by far the loudest, most unrelaxing meal at a "nice" restaurant on property that we have ever experienced. Now, I do have to say that the steak we ate that night was very good, but that was the only nice thing I could say about our evenig there.
Citricos was very good. Our server was very attentive, and the food was delicious. The evening was very nice and relaxed.
We also ate at Jiko and California Grill that week. CG was my favorite that week, probably followed by Jiko, then Citricos. I don't plan on returning to YS, though.