I probably wasn't clear in what I said. I don't look at talent or art in the "American" way, where everything has to have a "best" this or that. I do prefer and enjoy the songwriting of Stephen Stills to Neil Young, but that said, Neil has written many fine songs. Graham and David also had some fine songs individually as well as together.
@mwinkc I feel the same way about 4 + 20. It's a simple masterpiece.