Till The World Ends vs Invitation
Hold It Against Me vs Make Me...
<--- HARDEST CHOICE EVER, I'M TORN 
Inside Out vs Private Show
I Wanna Go vs
Man On The Moon
How I Roll vs
Just Luv Me
(Drop Dead) Beautiful vs
Clumsy
Seal It With a Kiss vs Do You Wanna Come Over?
Big Fat Bass vs
Slumber Party
Trouble For Me vs
Just Like Me
Trip To Your Heart vs
Love Me Down
Gasoline vs
Hard To Forget Ya
Criminal vs
What You Need
Up N Down vs
Better
He About To Lose Me vs Change Your Mind
<--- LOVE Change Your Mind, but HATLM is a Britney fan classic
Selfish vs Liar
Don't Keep Me Waiting vs
If I'm Dancing
Scary vs Coupure Electique
Femme Fatale: 6
Glory: 9
Tie: 2
Both VERY solid albums, but Glory is: more experimental, Britney is way more involved in this, the lyrics are better, and her voice is not even close to being equally as processed as FF.
That being said:
Blackout > Glory > In The Zone > Femme Fatale hand down her BEST 4 albums.
