Averages:
Loose: 7.9167
The Dutchess: 7.2308
Back To Basics: 6.5714
The Sweet Escape: 6.0833
In my opinion, Loose is very clearly the best album out of the four.
The highs of Back to Basics, like Hurt, are better than the highs of The Dutchess, but I enjoyed Fergie's album as a whole more than Christina's.
And Gwen... I dunno what you were doing on some of those tracks.