All* full sized rifle rounds are supersonic and cause the cavitation the 5.56 has become infamous for (e.g. bruh it goes so fast it's basically explosive! - overheard in a cafe). The terminal effects of 5.56 on flesh are severe, but not moreso than other rifle rounds. A full sized rifle round will cause more damage and can do it from much further away.
* excepting a few that are deliberately manufactured to be subsonic, because they are niche products.
* excepting a few that are deliberately manufactured to be subsonic, because they are niche products.