I always thought I was a Keaton man, but the more I watch Chaplin's stuff, the more I think I prefer him. The Gold Rush, Modern Times, and The Kid I enjoy more than a lot of Buster's work. But there's also a lot of Buster I still haven't seen yet.
I think one problem I have with Buster Keaton is the presentation...Chaplin took much better care of his work, and it looks and sounds great today. Buster being as fucked over as he was did have the same kind of ownership, so preservation wasn't as consistent. I remember watching The General on Amazon some time ago and the transfer didn't look good and the score they'd added was so shitty.