Liferay really should have a table to show the difference but I haven't seen it.
You can read posts in the social office forum or google around.
Example of an old thread below. There were some other posts of SO limitations too. Sorry, I don't remember the details.
http://www.liferay.com/community/forums/-/message_boards/message/3328830
That said, if it satisfies your needs, it's probably good enough. No sense of getting a tools with features you don't need.
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