We are using Adobe LCDS 2.1 and thinking of Upgrading it to a higher version.. can someone tell me a brief Comparison of the LCDS versions available (3.1 , 4.1....) ????
The last version is 3.1 You need to read the documents from this url in order to understand what are the new features (the release is good but is not enough), and after that it would be good to try building a prototype (if you plan to use the data modeling for example) to see how they will fit into your current architecture.
I wouldn't do any upgrade unless there is a business reason (bugs, poor performance, luck of productivity) - for any product.