That is a loaded question. I have witnessed many mid-airs where at least one pilot would say that the other didn't hold their line. Bronze class seems to have the least amount of mid-airs. Might be based upon registration, speed, etc. Not really sure. Silver and Gold have their fair share of them. A couple guys have lost multiple planes this year. When I fly I try to find open space. This isn't always easy.
Jimmy Skids