If you are a runner and have to pick one or the other, the swing might be a better choice. The above study observed that it has a greater “horizontal mechanical output” than the snatch. Here is why it matters.
Russians measured the quad and hamstring strength of middle distance runners of different levels. They learned that while the hamstring strength keeps growing until the runner reaches the elite level, the quad strength grows until the CMS level (high intermediate)—and then drops way down. Among the reasons identified by the researcher: less experienced runners jump up and down overusing their quads and the elite do not waste their energy vertically and “paw” the ground instead to propel themselves straight forward. (Myakinchenko, 1983)