Drive both and decide if possible. Also keep in mind transporting and storage. You can get away with putting a RZR-S in a full size truck bed if needed or for day runs (which is nice). If you are planning on keeping it in a toy hauler and don't want to tow the hauler out every time you want to ride. When I first grabbed my RZR I knew I would need a second trailer as my toy hauler was full with my bike and quads. But if I wanted to just take the RZR and the toy hauler I was ok as the RZR fits fine in my toy hauler if I take the bikes out, however the Teryx would not fit in my toy hauler which meant taking two trailers on weekend trips (one with the RZR in it and then my toy hauler also). Not a huge deal but the Teryx was a little too long for my 23' toy hauler and would hit the counter. They are both great machines and you'll have fun with either. Also.... where do you ride.. what type terrain. I ask because some people have no plans to go to the dunes or others only go to dunes. I like to do it all, but on a particular trip to Glamis when the RZR-S was new out, a guy in camp had just got one and had paddles/buffs on it. We also had a Rhino and a 2009 Teryx plus about 6 quads on a ride from Gecko at pad 4 over to the washes. While crossing over I was on my YFZ450 quad and while the Rhino and Teryx took their own lines the guy in the RZR-S was right on our asses through the big bowls. We couldn't shake him. I was blown away with how the "S" could ride the bowls like a quad (in stock form at that). So if you are a sand person then I would strongly look at the "S".