Originally Posted by corky

I don't think it will make any difference . Unless you would normally have both on hand, i would pick one and just use that....either whipping cream, whole milk or half&half. None of those options should make anything cakey.
I suggest you pick one and make it....if you think heavy cream makes it too rich....next time use milk. Or if you use milk and want it thicker adjust next time . The cheese will add plenty of fat and thickness so I personally would use milk.