TOD
I don't know any of them all that well, but I could probably enjoy all the Sirks when in the right mood.
My first, or only, memory of watching one prior to my adult life was seeing IMITATION OF LIFE at a drive-in with my family, which I always remembered being at the Lauderdale Drive-In on Broward Blvd. (I knew you'd want to know that.) As a kid, I probably wasn't following the story all that closely, but I always remembered the scene at Coney Island, and Juanita Moore made a big impression on me. I am looking at IMDb now, and she just died last year, on January 1st, 2014. And you know when she was born? I'll tell you, since I'm looking right at it. October 19th, 1914. One hundred years, folks. Nearly a hundred and one.
I have to admit that what turned my attention to Sirk's films in recent years was seeing Todd Haynes' FAR FROM HEAVEN, after which I watched ALL THAT HEAVEN ALLOWS which I'd probably only seen in childhood on the TV. It's all great stuff. I hope somebody lists some good sudsers other than Sirk's, because I'm blank on any right now. (Coffee!)