Bomber you forgot GSA - probably the most physical of all, but what earns a yellow card in high school doesn't even earn a foul in club. Soccer is a contact sport, thats why 8th graders can't be on a varsity team.
Club - a couple yellow cards a season
High School - a couple yellow cards a week
There is definitely more yellow cards given in high school games. Problem is you are mixing such different levels of players and size on the field. You don't have that anywhere else. Club is fairly segregated into the same level of skill and age playing each other. College soccer as well (not age but skill) - except maybe in intramural soccer, but then intramural soccer is not fueled by overly passionate vocal fans in the stands yelling at refs and players or tough school rivalries. I would expect close conference games or close school rivalry games get a lot more "chippy" then two schools that don't care about each other.
