Beyoncé is my fave but of course the answer is Britney and isn't even close.
Beyoncé:
1. Crazy In Love
2. Baby Boy
3. Naughty Girl
4. Irreplaceable
5. Beautiful Liar
6. Listen
7. If I Were a Boy
8. Single Ladies (Put A Ring On It)
9. Halo
10. Sweet Dreams
11. Run The World (Girls)
12. Love On Top
13. Drunk In Love
Britney:
1. ...Baby One More Time
2. Sometimes
3. You Drive Me (Crazy)
4. Born To Make You Happy
5. Oops!...I Did It Again
6. Stronger
7. Lucky
8. I'm Slave 4 U
9. Overprotected
10. Me Againts The Music
11. Toxic
12. Everytime
13. My Prerogative
14. Do Somethin'
15. Gimme More
16. Piece Of Me
17. Womanizer
18. Circus
19. If U Seek Amy
20. Till the World Ends
21. I Wanna Go
22. Work Bitch