If you are looking for a matrix that provides every nook and cranny regarding what’s available in all SharePoint editions, whether SharePoint Online or otherwise, this is it. I located this in TechNet here, and decided to repost. Since we here at MS Project Now work extensively with Microsoft Project Server and Microsoft SharePoint Server, both in the online versions or otherwise, we get asked these questions on a regular basis. I especially like the matrix below because each feature item is a hyperlink that will bring you to the actual TechNet page with more detail. VERY NICE!
For your convenience a pdf version of the matrix may be downloaded here:
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Microsoft SharePoint 2013 Service Description Matrix