The black and white era seemed to produce better comedies - I love all the Will Hay films, and the Marx Brothers. Also the film noir stuff like Maltese Falcon, Key Largo, Double Indemnity, Cassablanca (OK, that's not film noir, but...), and horror - Frankenstein/Bride of Frankenstein, The Haunting, Dead of Night, and the Val Lewton/Jacque Tourneur films Cat People, I Walked with a Zombie, Night of the Demon, etc., and the old sci-fi's like It Came from Outer Space, Them, I Married a Monster from Outer Space, etc. (There's something about b&w that suits horror & scifi - maybe it makes it other-worldly. Imagine Eraserhead or Night of the Living Dead in colour - they wouldn't be half as good) (I think there is a colorized version of NOTLD around and, even worse, a colorized version of It's a Wonderful Life - the worst idea Hal Roach ever came up with)
BTW, I don't like It's a Wonderful Life - don't know what all the fuss is about. Sorry all fans out there.