The difference is in synchronization. If I subscribe to a Twitter feed, I get the contents of that feed no matter how I access my Twitter stream. With RSS, I have to make sure that my feeds are identical in all the browsers I use. Bookmark synchronization helps, but only for desktop browsers - I can't synchronize bookmarks (yet) between my desktop and my smartphone in a totally transparent way. Even with bookmark sync. taking care of synchronizing your subscriptions, there's still no way of synchronizing read items between instances. So items I read on my lunch break at work won't be marked as such when I get home.
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The difference is in synchronization. If I subscribe to a Twitter feed, I get the contents of that feed no matter how I access my Twitter stream. With RSS, I have to make sure that my feeds are identical in all the browsers I use. Bookmark synchronization helps, but only for desktop browsers - I can't synchronize bookmarks (yet) between my desktop and my smartphone in a totally transparent way. Even with bookmark sync. taking care of synchronizing your subscriptions, there's still no way of synchronizing read items between instances. So items I read on my lunch break at work won't be marked as such when I get home.