Crazy Kids is the more deserving winner imo; no other song in this rate boasts as much diversity. Those rapped verses and that gorgeously sung chorus, and the middle eight, really do kind of come together to make the perfect little hodgepodge of the sounds she's best known for. And those lyrics? Everything about it is 100% Ke$ha. If I had to pick a song that best represents the sounds explored on Animal + Cannibal and Warrior, this would be the one.
We R Who We R is good as well but a little too unremarkable and one-dimensional to take this. It's also not polarizing enough to be the winner. I feel like it's just floated by to get here -- people like it 'cause it's inoffensive, but not very many people properly stan for it.