RSS 2.0 has the widest acceptance of any feed format
RSS does not allow any well-formed XML markup in it's content
RSS has only three required fields on a per item basis- title, link and description
RSS requires descriptive fields such as title and link only in item breakdowns
ATOM
Atom is a relatively recent spec and is much more robust and feature-rich than RSS
Atom requires descriptive fields for both items and the full feed
Atom feeds provide an "updated" field which means that any feeds that are modified have a timestamp associated with them
Atom feeds usually contain a self pointer autodiscovery URL
more information can be obtained from Tim Bray's comparison site.
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