All 3 are very good sleds with real decent riding skids but are marketed differently according to what you want to do on your sled.The Apex and (new)Vector are basically identical trail sleds only the Alex has 150hp and the Vector has 120-125 whereas the Nytro is a hot doggin sled as I call it,used more for horsing around on.Don't get me wrong I have seen them on trail rides too it's just that they don't offer the wind protection and range of the other 2.I'm sure other people on the 4 stroke side can give you a better description of what other uses they put them through.