In a comparison between a track race and a drag race, logic tells us that the former is more dangerous than the latter. A full-fledged circuit requires more precision in handling and techniques honed for years, while a straight-line race relies heavily on the driver's reaction time and the capabilities of the machine.
However, if you think that drag races aren't dangerous, you're wrong and we have a video to prove that. As you can see in the footage embedded above, courtesy of YouTube's Turnpike Racing League, two Audi R8 coupes (one black, one white) lined up at a drag strip for a typical drag race.