My favvourite movie is 'Casablanca' ( 1942)
This is an American romantic drama film directed by Michael Curtiz based on Murray Burnett and Joan Alison's unproduced stage play. The film stars Humphrey Bogart.
I personally through the decades of the mostly-black-and-white era (most movies, most TVs if you weren't rich, newspaper photos, textbook illustrations, and most snapshots). Certainly, when you move to a more advanced technology, something is always lost. But I don't have much nostalgia for it.
I'll make some obvious choices: Citizen Kane (Orson Welles). Second choice: Casablanca (Humphrey Bogart, Ingrid Bergman). Third: Charlie Chaplin in Modern Times.
Here's an odd one: "H. G. Wells' Things to Come." Apparently the good prints have mostly been lost, even supposedly "restored" DVDs don't convey the sweep of the original.
When they started to "colorize" old black-and-white classics, people started to joke: "Have you seen the new all-color version of The Wizard of Oz?" (The first reel, set in Kansas, was in black-and-white; once she lands in Oz, everything is in color.) (It always bothered me that our first view of Oz is a colored scene framed by a colored doorway, when it ought to have been a color scene framed by a black-and-white doorway. That would have been quite possible with 1930s technology.
My favorite back and white movie is a title french : Les tontons flingueurs
but for the French accent English I liked to watch : Casablanca