What is more dangerous a dirt bike or a four wheeler?

It seriously depends on the situation and skill of the rider. A fourwheeler has an advantage in safety since it has a much more stable wheelbase but they are usually much heavier than motorcycles which makes them more dangerous in a roll over situation. A motorcycle is light and easily controlled by an experienced rider but the risk of having an accident is increased in hazrdous conditions because of the ease of laying the bike on its side when the tires lose traction. You are more likely to have an accident on a motorcycle but an accident on a fourwheeler can cause greater amounts of injury.