Currently Arkham Collection is $29.95 https://store.playstation.com/en-au/product/EP1018-CUSA00135… while Return to arkham is $69.95.
Wikipedia https://en.wikipedia.org/wiki/Batman:Arkham#Batman:_Arkham_Collection(2013)
says Arkham Collection includes Asylum, City and Origins, but on PSN it says it includes Asylum, City and Knight. Which is it?
Wikipedia and PSN both say that Return to Arkham has updated visuals, but only on PSN does it say Arkham Collection has updated visuals. But judging from the file size (Collection 114GB vs Return 49GB), they likely both have updated visuals. Or am I mistaken?
tl;dr: which games does Arkham Collection actually include and is it worth it for $30 right now?
Google is your friend.