Beautiful Fighters is one of the worst Ayu songs, imho. I despise is with passion and skip it on my single, but I must admit it grows on me little by little i.e. I can forget that I'm listening to it and not skip

I think Moments is the only track I really love on MY STORY... I sort of regret getting it, but I guess the making of Moments alone is worth the price ^_^
As for my absolute favorite single, I can't choose. The remixes never impressed me, and I only bought 2 singles so far, Endless sorrow for the original mix and cover, and BLUE BIRD for the poster <3
My favorite Ayu song is probably SCAR as I listen to it the most. But I also like a lot more and probably listed them in this thread before x_o