I was surprized to find that Reuven Lerner in Linux Journal assesses Atom to be the better technology between the different feeds. The article is not available on line anymore but if can get a issue of Novembers Linux Journal it is an interesting article.
At the Forge - Aggregating with Atom
By Reuven Lerner on Mon, 2004-11-01 00:00.
For all you who are in the Maryland area, I'll loan you my copy!