Looking at the top 20 from both sites you have to go ...
Rotten Tomatoes
1. Man on Wire (2008 )
2. Toy Story 2 (1999)
3. Taxi to the Dark Side (2007)
4. Toy Story (1995)
5. The Godfather (1972)
6. The Wizard of Oz (1939)
7. A Hard Day's Night (1964)
8. Deliver Us From Evil (2006)
9. A Separation (2011)
10. Waste Land (2010)
11. Rear Window (1954)
12. Afghan Star (2008 )
13. Citizen Kane (1941)
14. Dr. Strangelove Or How I Learned to Stop Worrying and Love the Bomb (1964)
15. North by Northwest (1959)
16. Aruitemo Aruitemo (Still Walking) (2008 )
17. Poetry (2010)
18. The Third Man (1949)
19. Le Gout Des Autres (The Taste of Others) (It Takes All Kinds) (2000)
20. All About Eve (1950)
IMDB
1. 9.2 The Shawshank Redemption (1994)
2. 9.2 The Godfather (1972)
3. 9.0 The Godfather: Part II (1974)
4. 8.9 The Good, the Bad and the Ugly (1966)
5. 8.9 Pulp Fiction (1994)
6. 8.9 12 Angry Men (1957)
7. 8.9 Schindler's List (1993)
8. 8.8 The Dark Knight (2008 )
9. 8.8 One Flew Over the Cuckoo's Nest (1975)
10. 8.8 The Lord of the Rings: The Return of the King (2003)
11. 8.8 Star Wars: Episode V - The Empire Strikes Back (1980)
12. 8.8 Fight Club (1999)
13. 8.8 Inception (2010)
14. 8.8 Seven Samurai (1954)
15. 8.7 The Lord of the Rings: The Fellowship of the Ring (2001)
16. 8.7 Goodfellas (1990)
17. 8.7 Star Wars: Episode IV - A New Hope (1977)
18. 8.7 City of God (2002)
19. 8.7 Casablanca (1942)
20. 8.7 The Matrix (1999)