I think there are 2 kind of riders. Those who have wrecked and those who are going to wreck. I ride both mx/hs,I broke my knee at Rathman's,I was in first gear clipped a tree and put my foot down to try to stop the fall and my handlebar landed on top of my knee, snap. I have crashed on the end of the big camel hump about 100 feet at Cycleranch, Did not break anything, and that is a fourth gear WFO get off. I have had many crash's and alot of injury's. I will not get in to the sky diving and other things that I have done,because that is not the question at hand.Just like the question is driving a car or flying a plane more dangerous.More people die in cars,but you can crash a car and live,crash a plane chances are against you living. One problem I see at Mx tracks is that people see other riders making those jumps and think they can do it when they have not had enough practice.It is always a good Idea to start slow and on little jumps and get used to the terrain. Bike set up is important,And safety gear. If I would have had knee braces on I would most likely have not broke my knee. I do not think that one is more Dangerous than the other. Just try to ride at your level not someone else's. I also would not have broke my knee if I had done what the army tought me in Jump School, that is, DO NOT REACH FOR THE GROUND, TUCK AND ROLL. Hard to remember when getting off a bike. Just an opinion and opinion's they say are like *******'s they all stink,except you own of course. Have fun riding I have for the last forty years.