I think the 5.1 would work better with less power or less speed, to much spinning and there are a lot of lugs to throw the snow out from underneath it, but at low speed or power levels there are a lot of lugs to push with. The PC is the opposite, you see better results the faster it spins, my dealer as a PC on a Apex running 14lbs and it flat kicks the chit out of other identical apex's I have seen (even though its a skinnier track), its got the rip your arms off feel even in 2' of pow. I think, for a lot of guys more to the west the new peak is going to be better all around because its stiffer. Lots of variable, I would run the stocker first, then change and you will have an idea of whats going on, and then we will know too. rider style and location play huge factors