I have Hankook H727s on my Mazda MPV and have put about 30K miles on them. I live in Houston so I have not driven the tires in snow. According to Consumer Reports, Hankook H727s are good in snow for all-season tires. I cannot confirm this observation but it sounds plausible to me.
I like the tires overall but Tire Rack tested these tires and rated their traction on wet pavement as below average. I agree. On wet pavement, the tires frequently slip on startup and easily lock up (ABS pulsing) under braking. On the other hand, the tires are very resistant to hydroplaning (my biggest concern in wet driving), a property that Tire Rack inexplicably does not test. For a driver who accelerates, corners, and brakes cautiously on wet pavement, Hankook H727s are a very good choice. The tires are quiet, ride well, handle reasonably well on dry pavement, wear well, and resist hydroplaning
I have no experience with Cooper CS 4 tires.