Difficult to say....

Casablanca is one of the best movies of the Film Noir era.

Bogart, Bergman, Claude Rains and Paul Henreid were perfect in their roles...

Gone with the Wind is a different Genre altogether .. The grand epic with a huge cast.

Clark Gable, Vivian Leigh, Leslie Howard, Hattie McDaniel, Butterfly McQueen....the cast is endless

Even George Reeve before his days as Superman....

You cant compare the two .... both giants of their Genre's

Compare Casablanca to Key Largo....

Compare Gone with the Wind to Ben Hur...