It's a virtual tie between "Original" and "Acappella".
The spoken word intro to "Original" is fantastic.
I really like the sound of "Acappella" and the feeling of being in a group singing together.
I also really like seeing the lyrics on screen. It reinforces the message.
You might consider adding a guitar track to "Acappella" and then adding the "Original" spoken word at the beginning of the track.