Review the below MOS document and which talks about the direction for Site Studio Deployments.
Oracle WebCenter Portal: Statement of Direction for Site Studio (SSXA) Deployments (Doc ID 1557940.1)
Hi Hari ,
Is Site Studio still recommended for Web Content Management?
Yes ,it is still the recommended approach for WCM .
As i understand Site Studio is being still provided as part of WebCenter Content, but is not being enhanced anymore. Is there an official directive on this? Is there an end-of-life for Site Studio yet, when WebCenter Sites takes over all the WEM/WCM capabilities provided by Oracle?
There is no clear directive yet on the course of action regarding this product but down the line it will be WC Sites that will be the strategic product .
So, if you are starting on something new and don't want to use Sites , then Site studio is the option to go for . It can be integrated with WC Portal as well which I believe is not the case with WC Sites .
Hope this helps.