If I may, I'd like to offer my experience from last weekend simply as a data point, not an attempt to stir any pots.
My buddy has a 2015 Renegade XRS with just over 500 miles and 96 studs. He weighs about 270lbs. with gear. I have a 2015 Polaris Switchback Assault 800 with 231 miles, no studs and weigh about 245lbs. with gear.
We rode 214 miles of trails with conditions ranging from ruler flat to 3 foot bumpy garbage. We also played off-trail a little bit.
I had the opportunity to ride his sled a little bit and I can say that the rMotion is very impressive. Probably the best rear suspension in the bumps that I've ever ridden. Cornering was pretty flat (flatter than my sled, which I expected), however it pushed a fair amount and he wasn't any 'faster' through the trails than I was (unless it was really bumpy). One thing I also really liked was how smooth the clutching was compared to mine. Engagement was VERY smooth and overall it performed very well. Overall, I really like his sled and perhaps the best way I can desribe it would be to say that it feels more 'refined' than mine.
On Sunday we did a little drag race (twice) on a perfectly flat trail per his request. We went from a 30mph roll both times and I let him get the hit (fully expecting to have him pull away from me anyway) and to our surprise, we were side by side up to about 80mph and then mine pulled ahead and kept pulling away...both times. Interestingly, the recall on his speedo said, "112mph" and mine read "103mph", so I'm not sure what to think of that. I checked mine against my GPS and it shows "101mph". So it appears his is off more than mine.
As an aside, my uncle was a Doo mechanic for about 25 years and my family has owned nothing but Doos since I was born, so there's no issue with my loyalty to any brand. I think they all have something good to offer...I've had good luck with Polaris stuff, but would defnitely look at Doo for my next purchase.
EDIT: Fuel economy-wise, his was about .2 mpg better than mine all weekend...so very close.