They come from two angles on the female experience. Adele is the hurt, cheated on woman seeking understanding. Amy was the cheater and she was showing us what why and how.

Back To Black is similar to Pearl by Janis Joplin as it is that glimpse of great potential that will not be realized. A time capsule just like 21. Hopefully Adele will continue with the numbered albums and we will see her potential realized.

Back to Black would be my choice since its a press play album. 21 is cool for what it is but there are just so many breakup songs. I would take 21 over Frank for what thats worth.

Both are the best albums of the year they were published... (2006 and 2011)

but I gotta say that I enjoy Back to Black more...