I prefer the Costner film. It is more historically accurate than Tombstone. Both films have inaccuracies in them but there are more of them in Tombstone. I have posted my opinions on Tombstone elsewhere in this forum so I won't repeat them here. I think both of these movies are great westerns. Maybe the 2 best westerns ever made. Dennis Quaid's portrayal of Doc Holliday is probably the closest thing to the real Doc that has ever been done on screen. That said, let me also say that I think Val Kilmer is one of the greatest actors of our times and even though his portrayal of Doc Holliday is less accruate than Dennis Quaid's, I think he took the role and molded the character into an extremely entertaining version of Doc, as he perceived him. That in itself is a sign of a truly great actor. Both films are good, well made westerns and whenever I watch one I usually follow it with the other. One other thing, dispite what is portrayed in these two movies and others that include Doc Holliday, Doc actually carried a 7.5 inch barreled, blue/cc Colt SAA 45, not the short barreled, nickle plated versions seen on screen.