How much do you weigh? The S2 is a do anything you want ski. It is bad ***. The A3 you really have to be on it but if you are it will pay dividends. Kind of like a Volkl on the water If you are running the course at below 28' off I would recommend demoing the A3.
buy one of wileyski.com in seattle and if you don't like it, send it back for the S2. They are great with that process. If you are free skiing or making passes at 28'+, like 22' off the the S2 is for you.