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For icy and wet road they will have better traction. also since transitional from different speeds will be less abrupt and less chance of wheel spin. That is a pro to heavy wheels.. Of course you have to be around those condidtions
All other things equal, a heavier wheel should be stronger. A lighter forged wheel can be stronger than a heavier cast wheel, but that's apples vs oranges. A heavy forged wheel on the other hand (are the Hammans forged?) should laugh at potholes that might destroy a lesser wheel.