This is a interesting comparison. Really you are comparing apples to oranges. Prinergy is a superior system to Odystar in the means that it offers a total solution. Web portal, database etc...
Odystar was developed to be a front end automation engine and later it was equipped with a PDF rip.
Odystar does not have the database, web portal or built in imposition but it does have better automation capabilities.
A better comparison would be
Odystar vs. EVO
Backstage vs. Prinergy.
All 4 are great systems, it just depends on what you are looking for.
Odystar = Superior automation. Weak on Job management as well as soft-proofing and approval chains
Prinergy = Very strong on all aspects. Also about 5 times the price of Odystar
A company I know uses prinergy for there screening and plating but they also have Odystar in front of the prinergy to do all the Automation that prinergy can't do. So while they are different style workflows, they do have the ability to compliment each other as well.
Just my thoughts.