Plot: Legendary lawman Wyatt Earp (Kurt Russell/Kevin Costner) teams with old friend Doc Holliday (Val Kilmer/Dennis Quaid) in an infamous gunfight at the O.K. Corral.

How to tell them apart: "Earp" is a broader biopic, where "Tombstone" is just an old-school gun-slinger of a Western.

Winner: Guns-blazing action vs. more historical accuracy? Take "Tombstone."