Hi,
Both are great guns and you couldn't go wrong with either. I don't have an Extrema 2, so I can't really comment on it , but a couple of my friends do, and they use their's solely for hunting. I just recently purchased a Super Sport. Like you, I wanted a gun solely for shooting clays. I did my research, and narrowed my choices to the Super Sport and the Beretta AL 391 Technys Gold Sporting. They were priced about the same , but I liked the fit and feel of the SS, much better. The SS is light, is a soft shooter and with it's 2 piece receiver, is quick and easy to clean.
Both the SS and the Extrema should cycle the lighter loads. I haven't shot anything less than 1 1/8 oz., but from what I have read, the SS should cycle 1 oz. loads. I'm going to give it a try , soon. Also, the Extrema 2 is a 3 1/2" gun. Personally, I don't need a 3 1/2 " gun for clays or for hunting. If the fit and feel of the SS is better for you , then I would say get it. I promise that you will absolutely love the gun!