There is no comparing the two. The Maverick is far superior in the suspension department over the XP. It has better shocks and over all a better design. There is very little to no body roll in a Maverick and it is very stable at high speed over whoops and almost anything you can throw at it. The XRS model comes with top of the line Fox shocks, minus their bottom out cup.
If you notice there is not one Maverick owner complaining about at shitty ride or bucking problems. Go over to the rzr forums and all you see is guys upgrading there shocks. Why spend 18,000 for a ride you will have to spend another $2,000 in suspension, when you can get it done in one purchase!
I have yet to meet one Maverick owner who was disappointed with the overall performance and ride quality.
Go to a dealer that sales both machines and look them over very. Once your are done you will be leaving with a Maverick!