Lower pour point is nice, and the lower MRV viscosity should help during the winter, making the oil easier to pump (less strain on the battery and starter). I wish the CCS was tested at the same temperature so I could compare those, but I bet the Quaker State Q Horsepower would edge out the Platinum.
Those are the only real things that the Quaker State Q Horsepower seems to have in its favor over the PP. I would love to see a VOA so I could compare additive levels, though. PP may very well have more calcium.