Unfiltered Review: Polaris 450 vs. 570 Just how stable are they? 

There is a few reasons why polaris's feel so stable. 1 is weight distribution and rider placement. 2 is how the suspension reacts to the clutching. 3 and this is most important, polaris does not use open differentials. If you have one of the models with turf mode you have a rear diff "unlocker". Yes unlocker, the passive is locked and active is unlocked. So for off camber and different traction from side to side or front to back you never have to stop and engage "lockers" it makes it extremely easy for riders of all levels to take on tough terrain without having to think about what their drive train is set too. You can just focus on driving. All these things combined are the reason why polaris has over 50% of the market. Also the 450 is actually a 500, which is why it out classes the other 450s. The normal sportsmans don't have turf mode but the x2 and I think touring do. Most the sxs have it now too.