I'd say mental. Physical is something that can heal over time (and some argue mental heals over time as well). There may be a physical scar, but you may not remember what the pain felt like (other than it hurt like a son of a bitch). Mental pain can be described to a T. I bet if anyone has mental scaring, they can tell you exactly what it is from and how it made them feel. Often times, mental pain changes a person comletely, even if it is only for a period of time.
Of course.. all of your perspective depends on how well of a pain tolerance you have, and how good of a mental tolerance (self-esteem) you have as well.
Just a tad of my .02