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We got the combo ticket for all four sites for 7 euro. We originally only saw the Teatro but found out about the other sites when the front attendant mentioned the combo ticket. All four sites are interesting and a reprieve from the crowds. Overall, recommend going to all four sites and learning about the Roman history of Zaragoza and Spain at large.
This site has the least information about it. Also be aware if they are showing the presentation video, the staff "close" access until it's over but it's not closed, you just have to wait (some people are complaining about this, just go grab a coffee at the corner and come back, problem solved). Staff are great.