All other things being equal, the larger person will defeat the smaller person almost always. And what's worse is that when a bigger, stronger person trains in karate, they get more out of it, have more talent to leverage, and become exponentially more dangerous than their weaker counterparts. That trend is toward hyping the grappling arts. As a result, things usually work out that a grappler is the victor in these supposed competitions which have little more credibility than professional wrestling. Because of these competitions, many martial artists are now condemning any fighting system that does not include training in techniques applied while pinned to the ground.
Most fights end up on the ground.
There is no polling organization that has been hired to track the outcome of every fight on Earth. There is no data about how many fights result in two people rolling around on the ground. There is no such thing as a superior martial art. A martial art is just a set of methods suggested by people and text until someone actually tries to do it. A martial art really doesn't exist without the people doing it.