I plan on buying some Kuhmo 712's for my car, but I can't decide between the VR or WR rated ones. I am not so much concerned about top speed (HR's would be fine if that was the case), but I am wondering if the WR's have a softer compound that would give better grip? The VR's have a treadwear rating of 340 and the WR's have a treadwear rating of 280. Price difference is minimal at $3/tire. Still, is there a good enough reason to get the WR's over the VR's?