For me it is Shostakovich I have always thought of him as a son of Ludwig.
I find the symphonies of both composers have the same feeling/intensity both composers use very simple themes and build around them a web of sound that appeals to me. Just a couple of interesting things I found on the www last night.I am pretty inexperienced with Shostakovich but I am intrigued now. What elements of it do you see similar to Beethoven? Is it his motivic treatment? What's your favorite by him?