I love them both.
Pearl Moon is indeed one of the best Kuu songs ever. She sings beautifully and lyrics are wonderful. Music also. And this is also a Kuu classic song. Piano songs from Kuu are beautiful. I think she should make more songs like these. I wouldn't mind. <3
Moon Crying is her newest song and very beautiful too. I love lyrics. Though they are a bit dramatic as is the whole song, but I love this song anyway. And I chose this song not just because it's new song. I chose this because it made me cry like Aishô, Ai no Uta, Yume no Uta and you did. I love songs if they "wake up" my emotions like that.
Pearl Moon has never done that but I still love it. Moon Crying did and that is why I voted it.
So Moon Crying for me. <3