Depends what sort of car, what sort of tyres, and how much snow. An "ordinary" car with 4wd is no match for a proper off-road style 4x4. Similarly, a 4x4 with road tyres is no match for a 4x4 with proper mud tyres (as the countless Discoveries I used to tow off caravan fields with my LandCruiser and 4Runner found out!).
In short, if you think you are going to have a real issue with snow where you live, the only real answer is to buy a proper 4x4 (not one of those boutique lookalikes) and equip it with good all-terrain or M+S tyres - General Grabber ATs never failed me anywhere.