570 vs 400.
Both riders similar in weight. 400 has aggressive gators and were throwing the snow, but the stock tires on the 570 were getting better grip.
Also did a tug of war with 570sp vs 570. I thought the sp with siping in the stock tires would have done better, but even with extra weight added, the 570 with non-siped tires was doing a better job pulling.