Princess Luna is a mare of routines. She wakes up in the afternoon, contemplates her life, and completes her duty. When Celestia gets sick, this uproots her routines and is a chance to change things for the better.
Soarin loves nothing more than winning. Well, he loves apple pie more and maybe a certain orange mare? He doesn't think much about it though with flying for the Wonderbolts but maybe that could change.