In four will the car will be controlled by 4 wheel and it's safer

well normal cars are two wheel drive and is controlled by a single gear or shift. while four wheel drive has 2 gears, when you want to drive on slippery or hilly road you will just put on the 4 wheel shift and will run on four wheel. continues four wheel drive makes the engine hot and also consume more fuel than normal one.

when u drive a four wheel drive it has more traction and it wont slip if u where riding a hill or mude riding but if u were 2 drive in a normal vehical it would slip.